Three Information Systems Development Methods Information Technology Essay

Three Information Systems Development Methods Information Technology Essay Information system in this present period is been used by organisations, institutions, businesses and many industries. Information system development method is a general technique and procedures that is been followed in stages by system developers in the process of building a system. However, there are different types of information system development method which will be stated later in the report. The main aim of this report is to briefly compare three types of information systems development methods (ISDM) out of the several types of ISDM that exist which will be stated later in the report. Although, this report is more interested in the common methods that are mostly used such as waterfall method, spiral method and systems development life cycle method. In addition to the compared method this report has also adopted six related topics that are connected and interrelated to the information system development method. These six topics include information systems development method, types of information system development methodologies, difference between software development methodology (SDM) and SDLC, difference between system analysis and system design and introduction to project management. The Waterfall Method The waterfall information system development method is one of the easiest and straight forward information systems development method that talks about series of activities in the others of requirement, design, implementation, verification, and maintenance which are done in stages were each stage of the activity stated have to be hundred percent accomplished before the following section can be done (Davidson, 2002). In addition, Cadle Yeates (2004, pp. 77-78) also explained that the end product of each section of the waterfall method is used as an inputs to the product of the following stage as a result it does not permit you to review the previous stage once it is crossed just like the way water flows sequentially. Consequently, Hurst (2007) also analyzed that the waterfall information systems development method has been argued by many to be a bad method because it is not possible for a project to get one stage fully completed and corrected before making ahead to the following stage . However, Hughes et al (2004) one of the biggest advantages the waterfall method has over spiral and system development life cycle is that its make good use of time in terms of management, very easy to manage and it is mostly used for smaller project were all requirements are known. Though, it also has some drawbacks which include high level of risk, been disciplined in completing each stage of the activities in the model. The series of activities in the waterfall method is shown in the diagram below. Fig 1: Waterfall model The Spiral Method This is another type of information systems development method just like the waterfall and the system development life cycle method that also has series of activities that have to be done one after the other but in a different approach. The spiral method combines the important features of both the waterfall method and the prototyping method and most concerned about risk analysis (Dawson, 2005). Although, the spiral method has four stages compared to the waterfall and system development life cycle method which is in the stated order, determine objective, identify and resolve risk, development and testing then finally plan the next execution. All these levels that are mentioned are constantly repeated over and over again section by section until all the difficulties of the waterfall method are rectify. However, some of it advantages is that it is not use for minor project, it takes a very long time to be completed and also it is very expensive to manage. Similarly, it also has some limitations which include, controlling high level of risk analysis in a system development and also used for project were all requirement are complex. Thus it could be concluded that the spiral information system development method is mostly used for larger and complicated system development where the entire requirements are very difficult to understand compared to the waterfall and system development life cycle method. A diagram showing how the spiral method works is shown below: Fig 2: Spiral model. System Development Life Cycle (SDLC) Method This is also another type of information system development method similar to the waterfall and the spiral method with series of activities followed in a circular other in stages through which every developer, database designer and project manager pass through as to develop an information system (Radack, 2009). The system development life cycle method is the overall cognitive process that takes place in the development of information systems in a gradual manner until there is an achievement of the best quality in the development of a system. In addition, (Dawson, 2005) also stated that the system development life cycle is the general process of developing, implementing, and constructing information systems through a multistep process from Requirement, Design, Build, Test and maintenance. However, some its features includes dividing stages into sub stages for easy management and also gives a room for going back to stage when there is a problem unlike the waterfall information system development method. It also has some limitations which includes not meeting the users requirements, not been stable, having lack of control and also having problems with documenting. On this basis, it can be inferred that the SDLC is a procedure that every information system development must pass through even if each of them emphasizes on different part of the five stages of the SDLC method. Below is a diagram that shows how the stages in the SDLC take place in a circular form moving from one stage to the other. Fig 3: System development life cycle model Information systems development method. A brief introduction of information system development method has been given at the beginning of this report but it will be better to look as the definition its self. Information systems development method (ISDM) is defined as: A collection of procedures, techniques, tools and documentation aids which help the system developers in their efforts to implement a new information system. A methodology will consist of phases, themselves consisting of sub phases, which will guide the systems developers in their choice of the techniques that might be appropriate at each stage of project and also help them plan, manage, control and evaluate information systems project (Avison Fitzgerald, 2006, p. 24). It is clear therefore that the information systems development methods concentrate on the general process of development. Categories of Information System Development Methods. Different categories of information systems development methods are considered in the outgrowth of developing an application. Although, every information systems development method has its own special way of approaching each stage of the ISDM process. Thus, the information system development method that exist include: Agile, SSM, SSADM, RAD, PRINCE, Spiral, SDLC, Waterfall, Object oriented, XP etc (Banks Wood-Harper, 2005). However, this information systems development method follows the same procedure known as life cycle. Difference between Software development methodology SDM and SDLC. Britton Doake (2006) differentiated the different between a software development methodology and system development life cycle as, a software development life cycle is mainly concerned about the overall development model of a system with different level of constructing procedures in addition to the sections and protocols that has to be used in completing each sections whereas a system development life cycle is strictly a sequence of activities that are carried out by designers and analyst to produced and implement an information system. Difference between System Analysis and System Design. Shelly (2008, p. 22) explain that System Analysis is the process of collecting or gathering all useful and possible requirement regarding the information system to be developed from the users and also determining how it will be put into the development of the system whereas System design is the process whereby all the requirement that was collected and analyzed during the system analysis stage is put together in the design of the system. Introduction to Project Management According to Kerzner (2006, pp.55-58), Project management can be defined as every unit of activity put to consideration or executed in achieving a common goal or task and the measurement of project success based on time, cost, and quality performance or scope critical success factors. However, information system development or project must be well managed in other to be successful. This is where project management is involved. In addition, project management deals more with the management of a project emphasizing more on time, cost and scope which are the most important issues in a project. Therefore, the main reason for managing a project is to present a well documented work or system development within a specific time in a full flesh package and of the best quality. Conclusion In conclusion, this report has been able to make a good comparison of three types of information system development methods which were waterfall, spiral and system development life cycle methods. In addition, it has also been able to include and discussed six topics that were related to information system development method.

Environmental Issue Essay -- Air Polution, Forest Destruction

Environmental problems are something which belongs to nature or known as â€Å"Mother Earth† [13]. Nature was created to help people survive from gathering foods until build a house. This phenomenon happens continuously without thinking how much damage that nature has because human’s fault. Nature gradually becomes worse and animal’s life in danger. People who are aware of the importance of nature react. Those people do several ways to save the environment. Although these efforts can return back the environment, these efforts only can be hold temporarily. This problem happens because those people who are aware of the environment only slightly; for remaining, there are people either do not know or do not care about the nature. People’s efforts that have helped to recover the nature become useless. Several ways of teaching about the importance of nature has been done to the people. Unfortunately, environmental problems still occur. There are some countries that experienced greater environmental problem than other countries. One of them is Indonesia. Indonesia is a country that has a large population. Development of science and technology make many Indonesian people use chemicals material or motor vehicles such as cars, motorcycles, and so on in life. Indonesian people mostly do not know knowledge of environment. These people do not know how to banish remainder like the rest of garbage, detergents, and the result of human waste correctly and where the remainder should be thrown away. Some people have banished garbage in river, sea, and another wrong place. As a result of wrong way in banishing and the use of motor vehicles within large quantity causes many environmental problems. There are several environmental problems in Indonesia with... ... Indonesian President, Susilo Bambang Yudhoyono also has created laws about forest [19]. The law contains a variety of explanations about the rules and how many fines to be given to persons who make the forest become damaged. With the law, persons who have destroyed forests is expected to be realized if the act of destroying forests are not only harming themselves but also other humans. Beside government, people should also realize the importance of forests especially leaders of industry that use the forest and the contents as production materials. From the people themselves, a group of people invent a technology to restore forests that have been damaged [20]. So, there are so many ways done by the government and people in keeping and preserving the forests continuously although the effort is not reached 100% successful either restoration or protection of forests.

Othello Literary Essay

Othello Literary Essay Although Emilia is not the protagonist of the play, her role is very important in Othello. Through her conversations with Desdemona and Iago, we develop a finer understanding of their characters. She plays as a catalyst when stealing Desdemona's handkerchief, and exploits Iago's villainy. Through Emilia, we see Iago's personality better. Iago's sneering attitude towards his wife and women in general shows the lack of respect and low opinion he has for them. When he says â€Å"Come on, come on. You are pictures out of doors, bells in your parlours, wildcats in your kitchens, saints in your injuries, devils being offended, players in your housewifery, and housewives in your beds† (2. 1. 109-112) Iago is stating that Emilia is a whore who inflicts injuries on others, but puts on an appearance of innocence. In response of learning Iago's view of women, we learn that Emilia's cynical view of men is they â€Å"are all but stomachs, and we are all but food. They eat us hungrily, and when they are full, the belch us† (3. 4. 100-101). By this quote, we see how Emilia perceives men to use women for their own needs and then get rid of them. She openly admits to Desdemona in act 4, scene 3, that women should be equal to men, instead of seen as possessions and objects under their control. From her close relationship with Desdemona, we learn that she is really the honest and sweet woman she known to be. This helps us know that what Iago says to Othello are lies and makes her death even more tragic. Her loveless marriage with Iago is the mirror image of Desdemona and Othello's relationship. Therefore, it enhances the love and intimacy in their marriage. Emilia's major contribution in Othello is when she steals the handkerchief for her husband, Iago. When Emilia sees the handkerchief fall, she immediately picks it up, which is a major development, in not only Iago's plot, but also the plot of the play, and says â€Å"My wayward husband hath a hundred times woo'd me to steal it† (3. 3. 292-293). This shows that even though Emilia is cynical, she still wants to please her husband. Emilia knows this was the first gift Othello had given to Desdemona and means to give it back. Emilia says she will â€Å"have the work ta'en out and give't Iago† (3. 3. 296-297). Meaning she would have the handkerchief copied and given the copy to Iago, despite not knowing the purpose he wants it for. Unfortunately, she doesn’t have the chance to carry out her plan because Iago appears and snatches it from her. She protests â€Å"If it be not for some purpose of import, give't me again: poor lady, she'll run mad when she shall lack it† (3. 3. 316-318). Iago then, very rudely, tells her to keep her mouth shut and sends her away. Stealing the handkerchief is not only a dramatic moment in Othello, but a very important one, too. If Emilia had not found this handkerchief, Iago would not have been able to devise his plan. Being that he uses the handkerchief as evidence to convince Othello that Desdemona is having an affair with Cassio by dropping the handkerchief in his chamber. Emilia is oblivious to the fact that because of her single, wrongful act towards her mistress, Desdemona, she has sent herself and many other characters in the play to their death. From the little bit of Emilia that we see – or read – in the play, she is very obedient, as a Renaissance woman should be. But, as the play progresses, she finally shows a turn of character and becomes a strong and courageous woman. The last scene is when she is most authentically herself as she defends Desdemona, who is murdered on her bed by her husband Othello. Despite threats from Othello, she calls for help, and denounces Iago by saying â€Å"You told a lie, an odious, damned lie; upon my soul, a lie, a wicked lie. She false with Cassio! Did you say with Cassio? (5. 2. 180-182) when he entered the chamber with Montano, Lodovico, Gratiano, and Cassio. Iago continuously tells her to charm her tongue, but she will, with courage â€Å"speak as liberal as the north† (5. 2. 220). In a desperate attempt to save himself Iago commands Emilia to go home when she replies with â€Å"Good gentlemen, let me have leave to speak; 'tis proper I obey him, but not now. Perchance, Iago, I will ne'er go home† (5. 2. 195-197). Othello, trying to recover himself, explains to Gratiano the handkerchief he found in Cassio's hands. At the mention of the handkerchief, Emilia confesses â€Å"O thou dull Moor! That handkerchief thou speak'st of I found by fortune and did give my husband† (5. . 225-226). At this point, Othello knows he's been lied to. Iago stabs Emilia and escapes. Emilia is crucial because she is the only one that sees Iago for who he truly is, and because of Emilia's honesty and bravery, Othello knows he has committed an unlawful death. To sum up, Emilia is important because of the relationships she builds with other cha racters in the play, more importantly with Desdemona, which Iago exploits to use to his advantage and her unknowing help of stealing the handkerchief plays a critical role in his scheme.

Understanding Vocabulary Words in Context

Reading comprehension is one of the most difficult things to master on a standardized test. The test-makers evaluate skills like finding the main idea, making  inferences, determining  the authors purpose, and understanding vocabulary words, some of which you may have never been introduced to you before. The good news? You can understand vocabulary words based on the context of the passage - the words, clauses, and phrases around the unknown vocabulary word. You don’t have to memorize all the vocabulary words in the dictionary! Vocabulary Words in Context Example You might not understand the word, acerbity, by itself, but this sentence, â€Å"The acerbity of the lemon caused the little girl to spit out the bite she had just taken† helps you understand that the general meaning of acerbity must be â€Å"bitter or sour†. The context clues lemon and spitting out the bite, which provide more information in the sentence, help you understand what the vocabulary word means. Vocabulary Words In Context on a Test A question on a standardized test may look something like this: After the first day on the job, the bank’s new manager realized he would be busier than he had been led to believe. Not only was he assisting the bank tellers with their work, but his new boss had decided to inundate him with other tasks like creating security systems, managing the bank’s deposits and refunds, securing loans, and maintaining the daily operations. The new manager was exhausted as he locked the bank up for the night. The word â€Å"inundate† from the passage is closest in meaning to: overloadprovideassaultunderwhelm Hint: A way to figure out if your choice is correct is by putting the answer choice in the sentence in place of the vocabulary word. Which one fits the intended meaning the best? Youre right. Its overload. The first choice is the best pick, although assault is a close second. The only way that one would work is if the tone of the passage had been more negative. Understanding Vocabulary Words in Context Exercise Try to determine the meanings of the following italicized vocabulary words, based on the context clues in the sentences.Skill level: Easy Pablo always showed animosity toward his teachers by throwing spitballs and mouthing off, but his sister Mary was kind and sweet.The little girl was showing signs of ocular problems - she squinted to read the blackboard and complained of headaches after working on the computer for too long.The crowd rewarded the singer with plaudits, or extreme praise, by clapping and cheering during a standing ovation.Elena’s repudiation of Jerry’s bad table manners was obvious to everyone at dinner as she dropped her napkin and left the table.From the far past to the present day, the moon has been thought to cause lunacy. Some studies have shown that this momentary insanity does have some association to the moons phases.The old man’s hair was sparse rather than thick and full like it was when he was young.Janie was as devout as the Pope himself.My sister Kimmy shows a great abhorrence for crowds, whereas my little brother Michael loves to be the center of attention.When you adm onish someone, you point out his or her errors; an example would be scolding a child for misbehaving.The sorcerer’s minions, or devoted followers, were willing to perform any sorcery he could conjure.Ninety-seven pairs is a superfluous number of shoes.The spy was hung at the gallows of his homeland for his perfidious deeds.â€Å"Busy as a bee† and â€Å"quiet as a mouse† are hackneyed phrases – they’re used all the time.Amelia was as pretentious as a princess when she arrived at the party. She tossed her coat to the hostess and grabbed a drink out of a nearby guest’s hand.We always listen to my great-aunt because she is venerable, but we ignore my niece’s advice because she’s only six. Understanding Vocabulary Words in Context Answers hatred; extreme dislikerelated to the eyeextreme praise (the definition was right in the sentence)denial; refutation; negationinsanity; madness; psychosisthin; spare; light; meagerpious; religious; sincerehatred; loathing; disgustreprove; caution; reprimandcrony; underling; followerextra; surplus; redundantdisloyal; treacherous; deceitfultrite; clichà ©d; worn outshowy; pompous; exaggeratedrespected; esteemed; revered