PROTOCOL: Problem solving before instruction (PS-I) to promote learning and motivation in child and adult students

This is the protocol for a Campbell systematic review. The objectives are as follows: The purpose of this review is to synthesize the evidence about the efficacy of problem solving before instruction (PS-I) to promote learning and motivation in students. Specifically, this review is designed to answer the following questions: To what degree does PS-I affect learning and motivation, relative to alternative learning approaches? To what extent is the efficacy of PS-I associated with the use of different design features within it, including the use of group work, contrasting cases, and metacognitive guidance in the initial problem-solving activity, and the use of explanations that build upon students' solutions in the explicit instruction phase? To what extent is the relative efficacy of PS-I associated with the contextual factors of activities used as control, age of students, duration of the interventions, and learning domain? What is the quality of the existent evidence to evaluate these questions in terms of number of studies included and potential biases derived from publication and methodological restrictions?