Malaysian Registered Quantity Surveyors are being mandated by the Board of Quantity Surveyors Malaysian to participate in Continuing Professional Development (CPD) activities beginning from year 2001. At the root of CPD is the process of learning and Registered Quantity Surveyors are required to be learning participants. Understanding the learning preferences of the Registered Quantity Surveyors is one of the ways to ensure optimum participation in CPD activities. This paper examines the theoretical models of professional learning and focuses on formal, non-formal and informal learning. The findings of three surveys on Malaysian Registered Quantity Surveyors CPD in relation to their learning preferences and actual participation. are described and discussed. Registered Quantity Surveyors prefer CPD activities that are conducted either in formal, non-formal and informal learning contexts. There were no specific preferences for the three types of learning contexts. Actual types of participation by Registered Quantity Surveyors in CPD activities were mostly in non-formal and informal learning activities.