UCD is critical to successful development projects because UCD is an approach that supports the entire development process with user-centered activities, in order to create applications which are easy to use and are of added value to the intended users. There are studies out there to show that the majority of failed projects can be attributed to incomplete or inaccurate requirements and the biggest cost benefit of UCD is more accurately defining requirements. using UCD helps you define a clear understanding of user and task requirements, incorporate user feedback to refine requirements and design, active involvement of user to evaluate designs, and integrating user centered design with other development activities. Additionally, UCD affects the planning, analysis and requirements, design, and evaluation phases of SDLC.
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