The articles in. this issue seem to be converging on the concept of the “performance support system”—an integrated electronic job aid designed to support all the performance requirements of a given job or job function. The concept has implications for design of hypertext, other databases, job structure, organization structure, and training needs. The economic (business) case for performance support systems seems to position them as strategic investments, and the developers and managers of the systems will be responsible for the most critical asset of knowledge-based companies.