Because some methods are typically employed at several stages of development, both the investment and ROI may occur several times in the following diagrams.
During software development, the ROI of usability method mainly derives from the engineering-truth that early changes are less expensive that those during later stages of development.
Another very positive effect of usability integration may derive from a shared understanding of design principles and basic usability rules. Agile practices like pair programming especially foster the distribution of usability awareness.
After the software was delivered, several benefits can be measure if usability engineering contributed to the design if the product. Usually, well designed applications require less training effort. Moreover, several ROI-related usability studies have shown that support costs are likely to be much lower if usability was part of the software lifecycle.
Because people love to buy and use soft- and hardware that is easy to use and pleasurable, companies that understand the role of user interface usability can be more successful.
Naturally, usability quality cannot evolve if the functional requirements are not satisfied as well.
After all, usability investments provide the chance for some valuable benefits. However, usability efforts are not for free. It would therefore be dubious if usabilty engineers just talk of pure added value. Additional time and budget must be allocated for modelling and visualizing requirements. In the beginning, the usability ROI will be less concrete. At the latest, a closer look to the total costs of ownership help understanding why it is justifyable to invest between 5 to 10% into usability methods.
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