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<br />00ll~9 <br /> <br />~ <br />. <br /> <br />user interface <br /> <br />~ ~ <br /> <br />I data files 11i!l ll> 124 month study I <br /> <br />Figure I. Relationship of user to data files and model <br /> <br />Thus, the user of the interface interacts directly with the 24MSI, while the interface takes <br />care of executing the 24MSM, the 4MSM file inputs/outputs, and transferring and moving <br />24MSM datafiles. <br /> <br />5.0 Description - User Level <br /> <br />5.1 Design principles <br /> <br />A focused and well-defined project at the initial stages allowed for a rapid and thorough <br />design of the interface. The design was guided by some basic tenants or ideas of the inter- <br />face design that emerged during the course of the preliminary design dialogues. The first <br />was that the most important aspect of the interface was the need to fully support "what <br />if...?" scenario generations. This, in a sense, is the main goal of the interface. Secondly, <br />instead of the fairly cornmon approach of providing separate pre- and post-processing <br />modules, there appeared to be a strong need to break that distinction, thus simultaneously <br />displaying input and output on the screen. Thirdly, a strong emphasis was placed on the <br />readability of the interface. Especially important was using a readable font, careful combi- <br />nation of colors in the menus and dialogue boxes, and clear graphical displays. In further <br />support of this idea, the user can customize the interface in terms of the colors for the <br />tables, dialogue boxes, graph lines, etc. by specifying them in a user set-up file. Fourthly, <br />because the Colorado River Basin is operated by two coordinated but distinct regional <br />. offices, it was felt that this distinction should be continued in the interface, resulting in the <br />separation between Upper and Lower Colorado reservoirs at a fairly high level in the paths <br />of the interface menus. <br /> <br />24 Month Study Project Documenta1.ion Volume I <br /> <br />618191 <br /> <br />6 <br />