The Malaysia Education Master Plan 2006-2010 expresses the importance of critical and creative thinking, by stating that one of
its major goals in producing first class human resources in Malaysia is to arm the students with creative and critical thinking
abilities. As a consequence, educational transformation has been initiated, and creative and critical thinking teaching and learning
strategies have been implemented at the Malaysian schools. Therefore, it was anticipated that by the year 2010, students under
the new school system will exhibit higher levels of thinking styles, especially creative and critical thinking styles. An attempt
was initiated to build an instrument to collect and provide data concerning the two thinking styles of the students. The instrument
Yanpiaw Creative-Critical Thinking Styles Test or YCREATIVE-CRITICALS, consists of 34 items, will be used to measure
creative and critical thinking style of the students simultaneously. This article reports the building of the test and its validity and
reliability construction.