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2 DESIGNING SOFTWARE
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As you complete the layout of each form, validate it by comparing it with its associated scenarios Can the user easily perform the necessary task with the minimum number of steps Are the tasks that the user performs more often the most easily accessible By comparing the results of the user interface design with the scenarios, you ensure that every requirement is considered When you complete this step, you have the layout of the forms required for this application (or unit of work) If you developed the forms in Visual Studio, you can capture each form as a screen shot and paste it into a design document, along with a written description of the form s elements and how they behave This can be readily reviewed with the users and domain experts
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Designing Software
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Building a Prototype
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Users often want to try out the user interface instead of just looking at it in pictures That is the purpose of a prototype A prototype is a working example of the forms of your application A prototype normally is composed of the primary forms in the application (or unit of work), along with the navigation features to move between them Data displayed in each form is hard-coded into the form to minimize the amount of programming needed to display the form, yet give the user a good idea of how the form works Developing a prototype has many pros and cons, which is why this is an optional step The bene t of creating a prototype is that it allows the users to visualize the application and its navigation This gives the users a better feel for how the application works You can see how well your conceptual design works and how well it translates to the users tasks It helps you verify that the application does not feel different as the user moves from form to form And the users can identify problem areas early enough to change them In some cases, however, the users can mistake the prototype for the completed application This can cause dif culty if the application is complex and requires a signi cant amount of time to nish This is the downside of building a prototype If you want to build a prototype, the easiest way is to use Visual Studio See 3, Building Projects, for details on starting an application and 4 for details on building forms
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Summary
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The user interface design phase steps you through the process of detailing the user interface for your application The rst step is to de ne the overall design of the user interface This includes the conceptual design, de ning the standard look and feel, and the navigational design, identifying how the user moves between the forms in the application You then use the scenarios and the conceptual design to de ne the layout of each form in the application The layouts should be optimized to allow the user to readily perform the steps de ned in each scenario When you complete this process, you have a design document that describes the conceptual and navigational design It also contains screen shots of each primary form in the application, along with a description of its user interface elements
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Implementation-Centered Design
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In Visual Studio, it is easy to build an application by creating some forms and putting a little code here and a little code there This is ne if you are creating a simple demo application, but if you are building something of any signi cant size, or if others will be working with you, you need a more formal plan Imagine that you decide to build a house You buy some wood and start nailing boards together You may complete the house (or you may not), and it may keep out the rain (or it may not), and it may look okay (or it may not), but without a strong internal structure, you would be worried about that rst windstorm! What the house is missing is the architecture With a well-de ned architecture and an implementation plan, you can be con dent that what you build will reliably and resiliently ful ll its requirements This is just as true with software as it is with houses and of ce buildings The purpose of the implementation-centered design ( I ) phase of the GUIDS Methodology is to help you de ne an architecture and implementation plan for your application It walks you through a set of steps to help you consider all the implementation details The I phase is composed of the following steps:
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