By Henri Clément
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Extra info for Guide des miels
You do not go through the development cycle once; you continue to iterate and ﬁne-tune with each cycle until you get it right. No one gets all the information the ﬁrst time, no matter how expertly you execute each usability activity. 1 illustrates the ideal product lifecycle with these UCD processes incorporated. The key elements of “an early focus on users,” “empirical measurement of usage,” and “iterative design” are all incorporated. ” The “Design” phase (stage 2) ideally incorporates the “early focus on the user” and “empirical measurement” principles of UCD.
1. You will end up with a misguided product that won’t sell, or will be unusable and useless to the users and/or the company that purchases it. There are a variety of different requirements that factor into product development and there is often confusion between them. 2 illustrates some of the many requirements and sources that a product team must deal with. 2: Requirements sources Marketing (image based on Weigers 1999) specifies high-level requirements; requests changes Management provides business requirements and project parameters; requests changes Legal department handles licensing of tools and components Technical support assists users; provides input from customer bug reports and enhancement requests Product Development Team Describe user requirements and quality attributes; review requirements specify business, functional, and performance needs; request changes Business analysts Users specifies hardware interfaces the software must respect allocates system requirements to software; requests changes Hardware engineering System engineering We often encounter teams who say “We have already collected our user requirements,” but in reality they have collected functional or marketing requirements, not actual user requirements.
A Variety of Requirements Thanks to market pressure and a growing awareness of usability, many product teams now realize the importance of understanding their users and the consequences that result when users are unable to utilize products with maximum ease. As a result of this awareness, many companies have incorporated some of the UCD 8 User-centered Design • Incorporating User-centered Design Principles into the Product Lifecycle • A Variety of Requirements CHAPTER 1: INTRODUCTION TO USER REQUIREMENTS process into their product lifecycles.