In this paper we describe the development of a questionnaire designed to assess the

probability content knowledge of prospective primary school teachers. Three components of mathematical knowledge for teaching and three different meanings of probability (classical, frequentist and subjective) are considered. The questionnaire

content is based on curricular guidelines and primary school textbooks in Spain. The

items were selected and adapted, after expert judgment, from previous research. The

responses of 157 prospective primary school teachers were used to analyze the

psychometric properties of the questionnaire and to provide information about various

aspects of participants’ probability content knowledge.