Students in middle and elementary school have a poor understanding of basic experimental design – commonly known as the “Control of Variables Strategy” (CVS). The TED Tutor is an intelligent, computer-based, tutor that adapts instruction on experimental design to individual students based on its assessments of their knowledge and ability, and provides continuous feedback on students’ actions. We are embedding the TED Tutor in an adaptive computer-based instructional context in which a child selects a topic for a science fair project, and then designs and implements an experiment to explore that topic. The theoretical contribution of the Inquiry Science Project Tutor will be to determine the extent to which presenting CVS instruction in the context of other inquiry activities elicits sceptical scientific mindsets that evoke science goals of identifying causal factors, rather than engineering goals of trying to achieve specific outcomes. The practical aspects will be to increase robust learning when TED instruction guides students in their design of unconfounded experiments.