Dr Roy van den Brink-Budgen has been developing assessment materials in Critical Thinking for eighteen years, and has been teaching it for ten. His significant contribution to the development of the subject as one of growing importance in the curriculum is well-known. Roy has also probably taught more INSETs for staff in Critical Thinking than anyone else in the country. His previous book "Critical Thinking for Students" became the most widely-used textbook in the subject, commended by both teachers and students on many courses. He lives in Ipswich, UK. In one volume it covers: Unit 1. Credibility of evidence; how context can affect credibility; issues of perception, language, interpretation, and judgement; different types of evidence; results of bias; possible weaknesses and strengths; using a credibility calculus; judging a case. Unit 2. Assessing and developing argument; differences between arguments and other forms of persuasion; what forms arguments can take; the nature of conclusions; assumptions and evidence; evaluating arguments; special kinds of argument content; producing arguments.