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This article was created by a professional writer and edited by experienced copy editors, both qualified members of the Demand Media Studios community. All articles go through an editorial process that includes subject matter guidelines, plagiarism review, fact-checking, and other steps in effort to provide reliable information. Articles by By JOHN S, eHow Contributor updated: January 13, 2011 An assessment is a diagnostic process that measures an individual's behaviors, motivators, attitudes and competencies. Assessment tools comprise various instruments and procedures. These tools are largely used in educational institutions, nonprofit organizations and in the corporate world too. The success of designing and developing assessment tools is brought about by using scientific methods to do so. Instructions 1 Develop assessment tools with the candidates to be assessed in mind . Different scenarios call for different tools and modes of evaluation. Ensure that the instruments and p...