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286 CASE 13 Isis Mobile: A Case Study in Heuristic Evaluation Michael spent 2 weeks running the test sessions and 1 week preparing the data for the report. He confirmed a high success rate for completing tasks and that the majority of users reported the PDA was extremely intuitive to use. A few minor changes, such as changing some labels, were included as recommendations. Overall, these were easy fixes, and Michael was confident that the PDAs were ready to make their release on schedule. Isis Mobile benefited from planning and incorporating a heuristic evalu- ation early on in the design phase of their new product line. They were able to prevent usability problems from entering later phases of the project. They minimized cost in terms of time and rework and validated their design with users before release to ensure their product debut was not greeted with bad press and low sales, thus ensuring that end users would consider Isis Mobile for future purchases. James Cartwright was not only pleased with the outcome of their initial release, he was also inspired by the possibility of being able to further improve products in a way that would positively impact those who buy and use them. He believed he may have found a way to truly differentiate their brand in the marketplace. Going forward, as a direct result of the heuristic evaluation, James decided to hire a team of user-centered design personnel as part of the design team to help drive concepts into usable form and provide guidance throughout the product development process--not just at a point when concerns arise. He also mandated that a portion of the product development budget be allocated for usability studies and forward-looking research. He was convinced that the company would flourish because they were focusing on their customer's experience as a top priority. Summary The steps involved in planning and performing the heuristic evaluation included the following: · · · Identifying the evaluators; three to five is typical for a heuristic evaluation. Ensuring that evaluators do not collaborate before completion; this minimizes bias. Using a common rating scale for severity of issues; this ensures consistency.