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ROSIE (Rule-Oriented System for Implementing Expertise) is a computer programming language/environment developed for the Defense Advanced Research Projects Agency. ROSIE is designed specifically for developing expert systems, and its primary purpose is to aid the knowledge acquisition process. To this end, ROSIE assumes its most characteristic feature, an expressive and highly readable English-like syntax. This report constitutes a new reference manual and user's guide for the ROSIE programming language/environment. It consists of an informal yet detailed discussion of the syntax and semantics of ROSIE 3.0, including an explanation of the programming environment as a whole. The report supersedes all earlier documents describing ROSIE. A technical audience is assumed, but the introduction provides a comprehensive overview of the ROSIE language for those interested in a less technical presentation.

ROSIE (Rule-Oriented System for Implementing Expertise) is an English-like programming language that has evolved over the years into a highly readable, expressive, and powerful tool for building expert systems. Because the language mirrors English, it also serves as a medium of interaction between the knowledge engineer (the computer expert who creates the expert system) and the domain expert (the person whose expertise the system reflects). This report describes the ROSIE language, emphasizing recent changes and additions, which include meta-elements, shared databases, and demons. Meta-elements capture specific linguistic structures; shared databases provide a facility for coordinating interactions among multiple experts without introducing significant changes to the language; and demons are programs that awaken on specific conditions. The report describes the new facilities, discusses ROSIE's advantages and disadvantages, and considers future directions.