Radar in the Modern World Essay Example For Students

Radar in the Modern World Essay Scott MartinD. HylandEnglish 192Research PaperRadar in the Modern WorldRadar is usually taken for granted in these days of modern technology. Many people do not know how radar is really used, how it works, or why we need it. People are familiar with several uses of radar like police enforcement radar guns and radar that measures how fast a baseball is pitched in a major league game. These are only a few of the many uses radar has to offer. Radar can determine several properties of an object from a distance, such as its position, speed, direction of travel, and shape; it can also detect objects out of the range of sight in all weather conditions, making it a fundamental utility for many industries. The term radar actually came from the acronym representing RAdio Detection And Ranging. Radar is a detection system used to locate and identify objects. Simply put, radar is the process in which radio waves are emitted from the source of the system; those waves ricochet off objects in their path, and the radar system detects the echoes of signals that return. One would think that so important a contribution to the worlds technology would be chronicled with great care at every stepThis, unfortunately, is not the case, and for reasons quite understandable (Page 14). Sometimes history can be hard to distinguish from truth and legend, the history of radar is no exception. Many contributions have been made to the development of radar over the years. For many years prior and during the Second World War, radar was considered a top-secret military tool. Once it was made public, people used the existing information about radar to come up with their own variations for different applications. A s a result, the true origin of radar has become blurred within conflicting claims. Radar can be traced back as far as 1832 when British physicist Michael Faraday suggested the existence of an electromagnetic field between certain objects from his scientific observations. Working from these ideas, British physicist James Clerk Maxwell predicted mathematically the existence and behavior of radio waves in 1873. In 1886, physicist Heinrich Hertz from Germany and Elihu Thomson from America confirmed the existence of radio waves with demonstrations showing examples of reflection, refraction, and direction finding of radio waves. By 1904, Christian Hulsmeyer, a German inventor, applied for a patent for a device that used radio waves in a collision-avoidance device for ships. Hulsmeyers system was not very accurate and only signaled when two ships radio waves were in concurrent directions, which meant that they were headed directly for each other; however, it was only effective for a range of one mile. His detection device worked off the ships existing low-frequency radios which did not travel very far. In June of 1922, Italian radio expert, Guglielmo Marconi drew attention to the fact that he had observed the reflection of high-frequency waves by metallic objects many miles away (Page 183); soon after this discovery, many people from around the world began developing devices to use this discovery for navigation purposes . The first true discovery of radar was in September of 1922 when Americans Albert H. Taylor and Leo C. Young observed the interruption of high frequency radio communication by ship passing between transmitter and receiver. They also observed beats produced by large objects when they moved within the transmission area (between the source and receiver). Taylor and Young named it the beat method for a reason. While working with a high frequency radio communication from opposing sides of a river in New York, the normal steady tone that they were working on suddenly grew twice in loudness then faded into nothing. A short time after, the tone grew back to twice its original loudness, and then back down to its original decibel level. In curiosity, the men looked out to see that a large steam boat had just passed through their line of radio signal causing the gap in radio contact. Since both men were employed by the U.S. Navy, they knew the difficulties the navy had with guarding a harbor in low visibility (Page 21). At that moment, the first practical use of radar was born. Radar was still in its infancy, but ideas were showing up everywhere. In 1930, Young and Lawrence A. Hyland were studying at the U.S. Naval Research Laboratory, experimenting with a short-wave transmitter and receiver over several miles. The receiver started to pick up unusual reception, and the tone fluctuated up and down. Looking for what was wrong, Hyland checked and rechecked all the possibilities. Finally, he discovered that at every instance the mysterious ac tion took place, an airplane was flying overhead. With this new discovery, radar became a known science, and the military set up a formalized project titled Detection of Enemy Vessels and Aircraft by Radio (Page 26). These two discoveries by Young, Taylor, and Hyland were crucial in the development of the original form of radar. Without these discoveries, there would be no radar. Miles Davis Persuasive EssayThe implications of radar are unimaginably diverse, from police enforcement for speed all the way to satellite imaging. One of the most common encounters with radar people deal with is police-issued radar guns. Law enforcement officers use radar in order to tell them how fast drivers are traveling. Police must aim the radar at a reflective surface, such as a piece of metal on a car, and the gun picks up the returning waves; the returned waves are measured and calculated internally using the Doppler Principle. Doppler radar is used in many ways, and the most common way people encounter is on the television. The news at five oclock always shows the weather predictions for the upcoming days. The meteorologist shows several images of the United States. What he/she shows are the weather movements. They can easily look up weather movements using satellite imaging and radar. This radar is called Doppler Radar; it uses electric pulses out into the atmosphere almost constantly. The radar that returns is from the raindrops within a cloud. They can create a digital picture of the cloud shape from the different lengths of the returned microwaves. Over time, the cloud(s) move, and the radar in conjunction with satellite imaging, which also uses radar, creates a picture on a computer screen in turn, showed on viewers home televisions. Viewers are now accustomed to seeing the forecasts with the radar-produced images. Some consider radar the most useful tool in warfare. During World War II, both sides used radar as a fairly accurate indicator of location. Radar prevented the enemy from carrying out surprise aerial attacks. One thing that the radar could not yet perform is distinguish between friendly aircraft, enemy aircraft, or even a large flock of birds. The Japanese attack on Pearl Harbor on December 7, 1945 was a complete surprise on the Pacific fleet because the soldiers watching the radar saw the incoming aircraft and assumed it to be their own array of bombers returning early. Needless to say, radar has improved over the last 60 years. Military today depends on radar for more information today then they ever did before. Radar can be in fixed positions, mobile units, or even satellites. The element of surprise is a great advantage in military tactics, and the removal of the surprise can be quite beneficial to the defender. Military uses radar for two main reasons: to constantly scan for enemies or to pinpoint potential targets. It is extremely effective in both applications. Another effect radar has on the world is through the applications in aviation. Used all over the world in thousands of airports, radar has increased safety by an immeasurable degree. Depending on how large the airport may be, it could have its own radar system. Air traffic control uses radar to see aircrafts locations. Using the information about the location of the aircraft, the Air Traffic Control man/woman can direct the individual aircraft out of harms way. Several aircraft today, especially military, have display screens showing where other aircraft are. Even though they can see where the other aircraft is, the radar system is on the ground in a fixed point. Truly understanding how radar works takes a lot of dedication to the subject. Calculus and trigonometry are involved with the processing of radar. Many people have dedicated their lives to further understanding radar because of their interests. Throughout the world, radar has countless uses ranging from measuring how fast pitchers can throw the ball during a baseball game, what the weather is going to be, how fast a car is going down a street, and to the extremes of pinpointing the position of enemy defense posts. Without radar, life would not be the same. WORKS CITEDBritannica Concise Encyclopedia. 2004. Encyclopedia Britannica. 12 Oct. 2004 . Brookner, Eli. Radar Technology. Dedham, Eng. Artech, 1977. Cole, Henry W., Understanding RADAR. London: Collins, 1985. CopRadar.com. 1999. 26 Oct. 2004 . Freeman, Tony. What Is Imaging Radar? Jet Propulsion Laboratory-NASA. 26 Oct. 2004. . Online Air Defense Radar Museum. Radomes Inc. 2003. 26 Oct 2004. . Page, Robert Morris. The Origin of Radar. Garden City, NJ: Anchor, 1962. Radar Meteorology. 1997. University of Illinois. 26 Oct. 2004 . Shafford, A. Basic Radar. Knightsbridge: Modern UP, 1947. Toomay, J.C. Radar Principles for the Non-Specialist. 2nd ed. Mendham, NJ: Scitech, 1998.

Twelfth night appearance vs reality free essay sample

Many of the problems and confusions in Shakespeare’s â€Å"Twelfth Night† are the result of gender bending episodes, many of which involve disguise and deceit of one form or another. In the most prominent examples of disguise and appearance versus reality in Twelfth Night by William Shakespeare,appearances hide an important reality and sometimes actually hinder a character from developing or attaining his or her desire. Certainly, Viola in â€Å"Twelfth Night† by Shakespeare is the clearest example since her love for Orsino must go unrecognized until the appearance is exchanged for reality. Furthermore, the problems associated with deceit and reality create tension in â€Å"Twelfth Night† by Shakespeare, especially in the case of Malvolio. In addition to these more explicit examples of appearances not matching reality, there are other aspects to the play that are not entirely clear in terms of gender. For example, the typical love relationships in â€Å"Twelfth Night† by Shakespeare, especially between men, are often confused and somewhat ambiguous. We will write a custom essay sample on Twelfth night appearance vs reality or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Although by the end of â€Å"Twelfth Night† by Shakespeare, the reader is assured by the marriages and heterosexual unions of the central characters, one cannot completely ignore the larger implications and suggestions made such episodes of gender bending. The comedic nature of Twelfth Night is produced as a result of these mix-ups and without them, this could easily have been a tragedy in which frustrated lovers were scorned and siblings were lost and mourned for years. The action of â€Å"Twelfth Night† by Shakespeare is driven by Viola’s decision to voluntarily conceal her identity and go to work as a servant for the lovesick Orsino instead of Olivia. In one of the important quotes from Twelfth Night by Shakespeare She tells the Captain that she wishes to become a eunuch and begs him to, â€Å"Conceal me what I am, and be my aid / For such disguise as haply shall become / The form of my intent† (I. ii. 51-53). This disguise and gender confusion early in the play serves Viola quite well in the beginning, especially since she is a young woman alone in a strange city. With this vulnerability removed, she is now free to seek employment although she does not figure it will cause her as much trouble as it does. In the case of Viola/Cesario the appearance constitutes the reality for other characters, but of course, not for herself. As her love for her master grows, she finds herself wishing for the reality but is now so embroiled in events that she cannot turn back. She expresses her tension when she states, â€Å"O time, thou must untangle this, not I. / It is too hard a knot for me t’ untie† but realizes that she cannot, at this point at least, reveal her identity—the reality behind the appearance. There is a sense of hopelessness in the battle between what one sees and what is truth and it is best summed at the climax of this identity conflict when Viola, realizing that Olivia loves her/him, says, â€Å"Poor lady, she were better love a dream† (II. ii. 24). In other words, the dream is the appearance while the reality is unattainable because of it. It is only through another case of mistaken identity (the arrival of her brother) that she allowed to shed the appearance and engage in the reality. Through means of deceit, appearances and reality are confused as well in Twelfth Night. This is most obvious in the case of the trick played upon Malvolio. Interestingly, he is a character that is not necessarily likable, especially when we first encounter him, but at least he is one of the few that does not seem to have any kind of disguise other than the fact that his simple background does not match up with the grand vision he has of being â€Å"Count Malvolio. † Despite his outward participation in creating an appearance to replace reality, he still is a victim of this paradigm in his own thoughts. He has an enormous ego that allows him to look only at the outward appearances rather than into the deeper truth or reality and gladly takes on another appearance to satisfy the conditions set forth to (supposedly) make his wish reality. Malvolio grows into the role of the love object (which can be seen as a disguise of sorts) and wears the yellow stockings because he has been misled. His behavior echoes the words of Orsino, who laments, â€Å"So full of shapes is fancy / That it alone is high fantastical† (I. i. 14-15). In this line, Orsino is stating that â€Å"fancy† or romantic love is fantastical and not associated with reality. Whether it is Malvolio acting as a fool for love or Orsino who wishes only to lay about all day thinking about his Olivia in the beginning, the two themes are clear—love itself is the ultimate form appearances trumping reality and appearances, when taken too lightly, begin dictating reality. Appearances versus reality are also an issue for the reader of Twelfth Night as well as the characters. The play opens with a character deciding to take on another gender appearance and although there are characters who never take a formal disguise, gender identities and love interests still seem less than traditional throughout the play. For example, while it is almost expected that Viola/Cesario might have an inclination to love her master, it twists the situation later when the reader begins to see that perhaps Orsino might have a love interest in his boy servant. Even after Viola’s true appearance and reality is exposed and confirmed, Orsino still has a strange attachment to the idea of being more in love with the boy rather than the female behind him. At one point near the end, Orsino says, â€Å"Cesario, come— / For so you shall be while you are a man; / but when in other habits you are seen, / Orsino’s mistress and his fancy’s queen†   and this demonstrates that there is still an interchangeable nature to the gender and thus the reality over appearance in this situation. A similar example of unexpected love crossing gender lines can also be seen in the case of Antonio who follows Sebastian, not necessarily out of some sense of manly duty it seems, but rather because of â€Å"desire/ More sharp than filed steel† (III. iii. 4-5). While none of these less traditional gender pairings are ever confirmed by the ending, they give the play an even more confusing quality and bring the question of what appearances versus reality really means in any case. In sum, it seems as though Shakespeare wishes audiences to consider the true nature of reality when a multitude of appearances can have an effect on our perception of it. Also, by presenting the issue of appearances versus reality in so many contexts (cross-dressing, outright trickery, mistaken identity, and ambiguous love pairings) the reader is made to understand that appearances can sometimes be of little or no value. If all of the characters had been more in tune with reality rather than centering on their own and other characters’ appearances, one can easily assume this wouldn’t make such a grand comedy.

Scarlet Essays - English-language Films, The Scarlet Letter

Scarlet Letter And Pearl I can remember about six years ago when I realized that my parents were going to be divorced. I never understood why something so horrible was happening to me. I resented my parents for putting me through so much pain. I later realized my parents were ending their marriage because my father had committed adultery. I hated my father and felt sorry for my mother. I never ever looked at my father the same. I see myself as having something in common with the character Pearl in the novel The Scarlet Letter. I was not born a bastard, but we both were forced with the awful word of adultery placed on our names. The Scarlet Letter is a book of much symbolism. One of the most complex and misunderstood symbols in the book is Pearl, the daughter of Hester Prynne. Pearl and Hester have a major conflict that in turns contributes to the meaning of the work. In The Scarlet Letter, Hester, for her sins, received a scarlet letter, "A" which she had to wear upon her chest. This was the Puritan way of treating her as a criminal, for the crime of adultery. Hester would walk through the streets, she would be looked down upon as if she were some sort of demon from Hell, that committed a terrible crime. This would give her much mental anguish and grief. On the other hand, God's treatment of Hester for her sin was quite different than just a physical token: he gave Hester the punishment of a very unique child which she named Pearl. This punishment handed down from God was a constant mental and physical reminder to Hester of what she had done wrong, and she could not escape it. In this aspect, Pearl symbolized God's way of punishing Hester for adultery. The way Hester's life was ruined for so long was the ultimate price that Hester paid for Pearl. With Pearl, Hester's life was one almost never filled with joy, but instead a constant nagging. Pearl would harass her mother over the scarlet "A" which she wore. Pearl would also make her own "A" to wear, and sometimes she played games with her mother's "A", trying to hit it with rocks. When Hester would go into the town with Pearl, the other children would make fun of her, and Pearl would yell and throw dirt at them. Although Hester had so much trouble with Pearl, she still felt that Pearl was her treasure. Pearl was really the only thing that Hester had in life, and if Pearl wasn't in Hester's life, Hester would never have been able to go on. Once and a while, Pearl would bring joy to Hester's life, and that helped her to keep on living. Pearl really was the scarlet letter, because if Pearl had never been born, Hester would have never been found guilty of adultery, and thus never would have had to wear that burden upon her chest. Without that burden, Hester would have led a much better life then the one she had throughout the novel. I never had to go through as much anguish as Pearl, mostly because adultery is accepted, the President has even done it. Pearl represented the scarlet letter "A", she was a kind of burden, yet love for Hester. Pearl was more then her mother's only treasure; she was her mother's only source of survival. The way that my parents love me with a never ending love, this was too placed on Pearl and Hester.

Middle eastern music final question examples Essay Example

Middle eastern music final question examples Essay Example Middle eastern music final question examples Paper Middle eastern music final question examples Paper Essay Topic: Poetry The Egyptians and the Arab audiences in general felt connected to Kulthum because they heard their own stories in her songs and she represented and supported the Arab world through her performances One learns that her old fashioned ways included a preference to be interviewed without the means of recording t/f true Kulthum insisted that her band musicians had to learn new songs aurally she was against the use of music scores t/f true Kulthums roots were within the egyptian countryside; she was from a poor religious family She began her singing career as a child, along her fathers side, singing at religious celebrations (mulids) When she moved to Cairo in the 1920s, the city was thriving and cosmopolitan, but under British rule The technology that mostly promoted her career was radio Kulthum supported the 1952 revolution and Nasser. True or False? True Kulthum supported King Farouk and the British. True or False? False Kulthum financially supported the Egyptian government in the 1960s. True or False? True The Egyptians compared Kulthum with pyramids Kulthums stage presence: Which TWO of the following statements are true? 1. She encouraged people to dance along with her on the stage. 2. She used to hold a handkerchief as her personal trademark. 3. She looked very formal. 2 and 3 Some of the interviewees seemed eager to sing their personal Kulthum favorite song in front of the camera Kulthum was praised for her strong sense of nationalism. true Kulthums improvisational / embellishment skills are associated with: the concept and manifestation of tarab Which of the following is not a characteristic of classical music genres (consider both western and Arab classical music genres)? old, historical, large ensembles, formal context (all of the above) During the late 19th century, this music was performed in all but one of the following venues: Village/Rural weddings One of the following musical instruments is not included in the core takht ensemble: tabla The nay has a characteristic _______________ timbre. breathy The only zither chordophone in the takht ensemble is the: qanun One of the following musical genres is not part of the wasla form: shabi The highly expressive Layali (featured in track 14) is an improvisatory genre. true Track 14 is non-metrical. true Track 12 uses the __________ iqa. samai The iqa in the taqtuqa Il bahr nayim is played by the: riqq Which of the following is not an example of the expressions shouted out by the audience when experiencing tarab (refer to What makes Arab music unique on the content tab)? oh my eye what did we do to you to do this? are you trying to make us die today? (all of them) Is Music Haram? Which one of the following is true? the issue is contentious In an effort to address the issue of permissibility of music, Islamic scholars primarily look into: the quran and the hadith One of the following types of music has suffered much less from censorship that the rest: chanted poetry The following aspect is taken in consideration when examining the permissibility of a piece of music: context and content of lyrics In Turkey under Kemal Ataturk (see the related video Be Happy, its an Order on the content tab), the villagers were forced to listen to: western classical music Sufis (followers of Sufism, which is the mystical branch of Islam): embrace music as part of their rituals According to the hadith reviewed in the textbook, frame drums: are halal The interpolation of religious lyrics in a pop song is generally considered: blasphemous In Pop music; singing of a beloved homeland (see content tab), we learn that Islamic extremists banned rai claiming that: it embraced Western ways and featured sexually explicit lyrics Right after the Islamic revolution of 1979: Several Iranian singers left the country since music was banned Sherry Bijan and 3P (see their related music videos on the content tab), contemporary Iranian female singers, dont show their faces on their music videos because: if caught, they may be sentenced Iranian rap is: thriving but mostly underground Amr Diab is a singer of: shababi The song Albi ikhtarak: has similarities w/ Santanas smooth and has Latin/Spanish influences Tamally maak: is a shababi song and features a guitar The lyrics of Is salamu alaykum are more poetic that those of Tamally maak true or false false The Egyptian authorities frowned upon Hakim because of his use of the expression is-salamu alaykum shabi songs are upbeat and feature memorable choruses and have their roots in folk music Shabi emerged in the 1970s because the times were prosperous. true of false false Shabi emerged in the 1970s at a time when the Egyptians were looking for an alternative sound to that of Umm Kulthum and the old masters of tarab music. true of false true The sound of early shabi (listen to Ahmed Adawiyyas Bent El Sultan located on the content tab) sounds closer to classical Arab music with its use of a large firqa orchestra. true or false false Shabi music keeps the following musical elements of past musical traditions (tip: read textbook carefully; see close to the end of the chapter): iqa and maqam and call and response The lyrics of Hakims Il-kalam da kabir (textbook CD track 26) talk about a fathers agony in search of his lost son. true or false false Il-kalam da kabir (textbook CD track 26) features the ___________ iqa. saidi Contemporary shabi music (listen to Egypt 3 Cairo underground on the content tab): incorporates DJs and samples The shabi song Youll go to hell (listen to Egypt 3 Cairo underground on the content tab) targets singers who appear on sexually provocative music videos

Unemployment In UK and Effect of a Wage Increase Essay

Unemployment In UK and Effect of a Wage Increase - Essay Example Unemployment In UK and Effect of a Wage Increase In general, a minimum wage rate sets the price of hourly labour at a level that defies the ability of the market forces to determine the price of hourly labour. The legislated minimum wage, of course, is not set below the equilibrium wage rate or the wage rate in which the demand for labour is equal to the quantity of labour supplied or the hours of labour supplied. Otherwise, there would not be a need for a legislation of a minimum wage rate. Legislation on the minimum wage rate is usually above the equilibrium wage rate. At that level, however, or at the level in which the legislated minimum wage rate is higher than the equilibrium wage rate, the quantity demanded for labour or the number of hours of labour demanded is lower than the quantity of labour supplied or number of hours of labour supplied. Thus, involuntary unemployment takes place. In Baumol and Blinder discussion, the line segment AB represents the employment gap. The work of Mankiw and Gwartney et al. also supports the perspective articulated in Figure 1. Varian pointed out the wage increases can actually increase or decrease the supply of labour but Varian’s view on the matter may not be relevant because the wage increase that we are discussing pertain to the minimum wage. Baumol and Blinder pointed out, however, that research undertaken by economists David Cards and Alan Krueger in early 1992 for New Jersey and Pennsylvania reportedly did not provide support for the perspective reflected in Figure 1 because the New Jersey stores in which wages were higher produced more net hiring than their Pennsylvania counterparts whose wages are lower. Thus, even if Baumol and Blinder (2009, p. 115) articulated a conventional perspective on the impact of legislated minimum wage, the authors called for more studies. In another section of Baumol and Blinder (2009, p. 201-202), the authors viewed that an increase in the nominal increase in nominal wage at current prices lead to a leftward shift in the ag gregate supply curve. This is because the marginal costs for output will increase with an increase in the minimum wage. Baumol and Blinder (2009), however, did not clarify if the economic model represented in Figure 2 will also apply to a vertical aggregate supply curve but it seems appropriate to view that it is probably the case. Thus, it is possible that a net effect of an increase in the minimum hourly wage for labour above 21 years old will be to contract the economy, assuming that increasing the minimum wage for above 21 years old will have a net effect of increasing the overall minimum hourly wage. In addition, if the Baumol and Blinder perspective (2009, p. 201-202) applies, the increase in hourly minimum wage (assuming the increase in minimum wage for labour above 21 years old will have that effect), will also lead to an increase in the price level. Of course, we are assuming here that aggregate demand is unchanged. The current world crisis has probably shifted the aggregat e demand to the left and, thus, it is more likely that the contraction will not be associated to a significant increase in prices. Figure 2. Nominal wage and the aggregate supply curve Baumol and Blinde

The Concept and Process of Leadership Essay Example | Topics and Well Written Essays - 2000 words

The Concept and Process of Leadership - Essay Example This research will begin with the statement that leadership entails a process whereby an individual can influence other workers to achieve a particular objective, and able to direct an organization in the way that enhances the cohesiveness and coherence. However, while leadership involves a learning process, it is also important to note that, a person’s attributes, values or beliefs have an influence on the leadership process. This is because these characters make a leader be unique in the workplace. In order to become an efficient and effective leader, a person needs to develop an honest understanding of himself or herself, what he or she knows and their capabilities as a prospective leader of an organization or a team within the work environment. In the end, the followers of a leader can determine whether an individual is a good leader within an organizational setting. As such, it is important for leaders to exhibit trust and confidence when leading others people or workers within the organization setting. Being a leader entails convincing followers and not superiors of your worthiness to be followed by other workers. Conversely, while convincing followers of their worthiness to be followed, leaders need to note that different people within the workplace require different leadership styles. For instance, new employees in an organization need to be supervised more compared to experienced workers in the same organization. As such, leadership process requires leaders to understand the needs of those they lead. Further, communication is also important in terms of establishing a working alliance between the leader and other workers. This helps to avoid misunderstanding between the leader and other workers in an organization. Leadership process also entails developing an understanding of various situations that may arise within the work environment, this is because the different situation requires a different measure to be taken. As such, a leader needs to d evelop a sound judgment regarding the best option or leadership style to use for each emerging situation.

Priciples of Software Engineering Essay Example for Free

Priciples of Software Engineering Essay Describe each law in your own words. Illustrate with a practical example ? Glass’ law â€Å"Requirement deficiencies are the prime source of project failures Coming to my explanation Glass law states that if the basic requirements of the projects is not constructed properly that may leads failure of the project. To achieve goals in the project it plays an vital role and any drawbacks may leads project unsuccessful. Around 20% of all IT project failures were caused by incomplete or badly managed requirements. Example: Technological University-Online Practical Tests In the case of technological university the requirements specifications for the online practical exams had been implemented without consulting students and university staff. This system was designed in such a way that students affliated to that university are write the test test online at the same day and same time. Considering the requirements of the colleges were different an the project objectives were different. This leads to failure of the that project. Boehm’s first law â€Å"Errors are most frequent during the requirements and design activities and are the more expensive the later they are removed†. Coming to my explanation Boehm’s law states that the basic designing of the projects mat leads to errors and miscalculations. The sooner you find a problem, the cheaper it is to fix , otherwise to detect the errors in the project is very expensive or complicated . This law is applicable from midrange systems. Example: City Council – Pay Roll System A city council developed a replacement payroll system believed that users had comprehensive knowledge of all the business requirements. But the current staff or IT team had participated in building the old system they had no knowledge of how it was built. That leads to many errors and it cause project failure. Boehm’s second law â€Å"Prototyping (significantly) reduces requirement and design errors, especially for user interfaces†. Coming to my explanation Boehm’s second law states that by prototype modelling the disigning of the project and errors can be reduced. To design the system the staff will be educated . So that that will increase the usability of the system among users. Example: In a postgraduation course prototype modelling experiments were conducted . Some of them were used requirement driven approach and others are prototyping approach. This will leads to satisfaction for the client compare to all other methods. Davis’ law â€Å"The value of a model depends on the view taken, but none is best for all purposes†. Coming to my explanation Davi’s law states that to describe systems requirements, it is very useful. This model is useful to solve the complicated tasks that other models find that difficult to solve. Example:In a system to solve the problems different methods were implemented. Each task follows their methodolgies to solve the problems. At the end all the methods got different results but there methodologies is useful to solve the problem. Your first task is to describe each software development methodology clearly and completely in your own words. You may use diagrams, examples or UML to help you do this. Waterfall Model : The waterfall model is a sequential software development process, in which progress is seen as flowing steadily downwards through the phases of conception, design, analysis, initiation ,testing and maintenance. This model is used in manufacturing industries and construction industries . It is ; highly structured physical environments in which after-the-fact changes are prohibitively costly, if not impossible. Since no formal software development methodologies existed at the time, this hardware-oriented model was simply adapted for software development. For example, one first completes requirements specification, which after sign-off are considered set in stone. When the requirements are fully completed, one proceeds to design. Spiral Model: The spiral model is a software development process combining elements of both design and prototyping-in-stages, in an effort to combine advantages of top-down and bottom-up concepts. Each phase starts with a design goal and ends with the client reviewing the progress . Analysis and engineering efforts are applied at each phase of the project, with an eye toward the end goal of the project. The spiral model might mean that you have a rough-cut of user elements as an operable application, add features in phases, and, at some point, add the final graphics. The Spiral model is used most often in large projects and needs constant review to stay on target. It can get their hands in and start working on a project earlier. Q3) Using the first four laws of the text, show where these are either implemented or missing in each software development methodology (Total Two). If a law is missing, explain the consequences and suggest how the process might be improved. Water Fall Model Glass’ law Requirement deficiencies are the prime source of project failures. The end users gathered by requirements in waterfall model. It states that the basic requirements of the projects is not constructed properly that may leads failure of the project. The failures were caused by incomplete or badly managed requirements. Boehm’s first law â€Å"Errors are most frequent during the requirements and design activities and are the more expensive the later they are removed†. It basic designing of the projects mat leads to errors and miscalculations. In waterfall model this law cannot be able to correct the errors. This law is not reliable for waterfall model. Boehm’s second law Prototyping (significantly) reduces requirement and design errors, especially for user interfaces†. This law cannot be able to correct the errors in waterfall model. The design phase would be reduced by prototype modelling. Davis’ law â€Å"The value of a model depends on the view taken, but none is best for all purposes†. The purpose of this model is not suitable for this law. Spiral Model Glass’ law â€Å"Requirement deficiencies are the prime source of project failures In waterfall model risk analysis is conducted on the prototype. By this if they need any requirement it will included in next stage. Boehm’s first law â€Å"Errors are most frequent during the requirements and design activities and are the more expensive the later they are removed†. In spiral model each phase starts with a design goal and ends with the client reviewing the progress . The risks were eliminated after number of stages. Boehm’s second law â€Å"Prototyping (significantly) reduces requirement and design errors, especially for user interfaces†. In spiral model it will design the prototype. and construct and design the prototype. The analysis and engineering efforts are applied at each phase of the project.