The present study based on Antonietti, A., Ignazi, S., & Perego, P. (2000). Metacognitive knowledge about problem-solving methods. "British Journal of Educational Psychology, 70", 1-16 methodology with the aim to examine primary school teachers' metacognitive knowledge about problem-solving strategies. A sample of 338 in-service (172) and pre-service (166) teachers participated in the study. They were asked to give on a five-point scale frequency, efficacy, and facility estimates for the application of five problem-solving strategies in 3 kinds of problems (interpersonal, practical, and study problems). The results are in accordance with Antonietti, A., Ignazi, S., & Perego, P. (2000). Metacognitive knowledge about problem-solving methods. "British Journal of Educational Psychology, 70", 1-16 evidence. They, also, stressed the possible role of age along with work experience in the formation of beliefs about strategic behavior. (Contains 4 tables.)