Having stepped down as editor of Educational Technology Research & Development after 15 years of service, and having learned much from Steve Ross, who served as editor for 18 years, and from many of the leading scholars in the broad and multidisciplinary field of educational technology, I have been thinking of the value added by the research…

Effective and efficient measurement of the development of skill and knowledge, especially in domains of human activity that involve complex and challenging problems, is important with regard to workplace and academic performance. However, there has been little progress in the area of practical measurement and assessment, due in part to the lack of…