Described are the initial prototypes of several intelligent tutoring systems designed to build students' scientific inquiry skills. These inquiry skills are taught in the context of acquiring knowledge of principles from a microworld that models a specific domain. This paper discusses microworlds that have been implemented for microeconomics, electricity, and light refraction. All of the systems are highly interactive; students can pose questions, conduct experiments by manipulating domain specific factors, and record results. Important inquiry strategies were identified using protocol studies of expert and non-expert learners. These strategies are formally represented. The paper also describes a partially implemented "inquiry coach." This coach will be incorporated into the microworlds and teach the inquiry strategies in the context of the specific miroworld domain knowledge. (Author/CW)