Responsiveness: usually measured in terms of rate of communication between the system and a user. Evaluating design options with Simplex One Perception Response Abstract working memory Long-term memory Executive functions Waterfall Model- The traditional method of engineering computer systems. Weaknesses of the Waterfall model Often focus on the technology or take purely technical system approach Often reflect only the views of the designer rather than other important stakeholders The user interface is often designed around a technical view of how the system works The problem lies partly with the processes by which systems are developed Stages of the Waterfall Model Requirements Specification- This is the first stage in the Waterfall model and the most critical. For this reason, the outcome of this stage- the requirements specification should be based upon a good understanding of the users and their needs. oDifferent types of Requirements Functional requirements: Specify what functions are needed. For example, provide a means of undoing an action Data requirements: Specify the data inputs and outputs of the system. For example, in car rental
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- Fall '20