This book was carried out to examine the predictive relationships of student characteristics towards critical thinking dispositions. The Critical Thinking Disposition (CTD) was used to gather data. The respondents were drawn from undergraduate students at a public university. The critical thinking dispositions instrument included seven elements namely: analyticity, open minded, truth seeking, systematicity, self-confidence, inquisitiveness and maturity. Three objectives were stipulated, 1) to identify the CTD levels among undergraduate students from different majors of study (science-based and arts-based) versus, gender and academic year of study; 2) to identify the CTS levels among undergraduate students from different majors of study (science and arts-based) versus, gender and academic year of study; 3) to identify the dominant CTD elements that may influence CTS.