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<br />Description of Existing Model <br /> <br />8 <br /> <br />Usability and Documentation <br /> <br />, <br /> <br />Although the existing model is described in detail in the Phase I study reports and was delivered <br />to the Water Resources and Power Development Authority for possible distribmion to others, it does not <br />incorporate a user interface or documentation that would make its use by others convenient. If the new <br />planning model is to he used by a variery of persons having varying technical capabilities, such an inter. <br />face and documentation are essential. <br /> <br />In developing user interface software there is a tradeoff between usability and ncxibility that <br />must be kept in mind. Generally speaking, the more narrowly defined the user interface fealUres, the <br />easier the interface is (0 interpret and use; the user basically has a simpler task because he or she has <br />fewer alternatives to choose from. However, by having fewer alternatives to choose from the user loses <br />some flexibHiry to address unanticipated silUalions. An interface that provides maximum flexibility also <br />provides the user with the maximum freedom to make mistakes and misuse the software. <br /> <br />I <br /> <br />. <br />