Category: Project Management

the design phase factors to be considered when desiging the output requirements,”in a top down approach to a system design, the programmer will start by idefntifiying the output that the system will need to produce. There are a number of possible output formats that must be considered including such items as printer, screen, plotter, audio, email links to webpages, autmated fax facilities, and computer output microfilm. THere are many more possible output devices that could be incorporated into any system-it will depend on the tehcnology that is available to the developers. There are sound reasons for starting the system development with the diesign of the output, The system will be implemented to help improve effectviness or to solve a problem. In order to do this the first step will be to determine what can be done to help the situation. Once this has been done, a clear picture of what has to be provided can be identided. This will shape the output requirements of the system. while the output may seem to be the last part of the system they should be developed. It should not be. In order to make the system a success it must be able to produce the outcomes that can solve the problem, therefore the output required needs to be identified early in the process. Once the output has been identified it will place constaits on the system. These constraits will include requirements of data to be collected to procude the output and to the limitations imposed by the technologies used to create the output. While it may sound minor the manner in which output is to be created and/or displayed is actually of great significance to the design of a computer system. This is becuase it can quickly change the nature of the resources that are reuqired by the system to produce the output. For example, if the system is to collect pictures that are displayed over the web then the file size will not have to be as large as those printed. SOme of those major constaits on output include:printers-print quality e.g. laser inkjet/color and the nature of the information to be produced for example if a recipt is to be printed and needs to be made in duplicate then an impact printer will need to be used or the item printed twice. Screen if the output is primarily to be screen based then the scree nwill impose a number of limitations on the output. THe output will need to be designed to fit into the screen size. If the screen is onochrome

Project Management

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the desing phase factors to be considered when diesiing the input reuqairments,”having established what the systme needs to produce to nmeet it;s goals the next are of interest is establishing what data needs to be obtained to peoduce that output. THe design of the input is vital to the successful creation of a computer system. Put simply m the input must be collected from the various sources with a minimal amounf of errors, and with the greatest possible speed. A common term used to describe data entry is GIGO-garbage in, garbage out this expression highlights the importance of input design of the quality of the program produced . THe final output will only be accurate as the data put into the system and the quality of the data will be partly determined by the quality of the design of the collective methods. There are a number of techniques that a good programmer will use to ensure that the data they cfollect is of the best quality possible they will limit the opportunities for the user to enter the wrong data. and will ensure the user does not have to enter data there. When desigining input, the programmer should: Identify duplicate data-effecient program design requires that the program only collect and store each data element once. Programmers should analyse the data requirments and identify where data is used more than once and ensure it is collected just once. It is important to do this- while it may be easier to collect data more than once, rather than create highly complex data structures, this approach compromises the integrity of the infgormation produced as it allows for more input errors and the erection of conflicating outputs. Identify methods of reducing input errors- when collecting data, the programmer should make use of as many of the features available to ensure that the data being collected is as free from errors as possible. This can be achieved through the use of features like deop down boxes, radio buttons, check buttons, etc. That limit the user to selecting from pre-defined “”correct”” options. By carefully constructing input screens, it is possible to limit the number of areas the user can enter invalid data. Identify data validation checks while it is possible to limit the users choices to pre-defined choices it may not always Be possible or practical to do so an example would be post codes. While all postcodes are pre-defined, there are so many of them it would not be possible to list them on a screen, so another method must be employeed to make sure the data is accurate, Writing code to check the data is accurate can do this. For example the postcodes could be checkeed to see if they fall withing the expected range for the state given. WHile this relies on the user to input correct data, it does reduce the amound of incorrect data the system collects. Input screen/ method design- thought needs to be given to the actual dsign of the input collection screen or methods care needs to be taken to ensure the screens that collect the data are arranged in an attractive and logical manner

Project Management

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Sevison Multimedia,”sevison multimedia informations flow wiwithing the company showing how the various employees interact with each other in the system. An important phase in the developemtn of a new system is the documentation of the infromation flow withing the existing systgem. In this step all the data in the system is recorded from when it is recieved through manipulation in the system, until the final information is proposed. In each phase it is provdiiging the system with the data, performing the manipulation and recieiving the infromation that is produced. There are a number of tools that are used to represent these features-data flow diagrams DFDs. content diagrams and entry relationship diagrams. The reason why this stage is so important, is that it allows the analyst to develop a complete understanding of the way in which the various parties interact with each other in the benfitis of identifying the areas in which the company has direct contact and those for which it must rely on outside sources. Obviously, when designing a new system there is no point in changing areas, which the compnay has no control over, such as specifying data muyst be recivived in a particular way

Project Management

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data flow (picture),”`identifycation and description of problem areas in the system, which are grouped and become the basis for the development of the new system is the final stage of the analysis phase. Here the analayust will look at all of the data that they have collected and decided where the current systems performance can be improved. The analyst will then reconstruct the DFOs to represent the propsed changes

Project Management

Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.data flow (picture),”`identifycation and description[…]

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