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DITORIAL AI Magazine Volume 11 Number 2 (1990) ( AAAI) In this issue, Luc Steels takes a new and insightful look at knowledgebased systems and provides a synthesis of several different approaches to analyzing expertise. It's a long article but, in my opinion, an important one. I recommend it to anyone with an interest in knowledge-level analysis of expert systems. On the same general topic of expert systems but from a different perspective is the article by Rob Weitz, who proposes a methodology for forecasting the impact of expert systems on the workplace over the near term. Finally, James Hendler, Austin Tate, and Mark Drummond present an extensive survey of AI systems and techniques for plan generation.