The book contains the course notes for the Computer Studies/Computer Science course for the Bachelor of Education program at OISE/UT. This the the course taken by graduate students who want to become Computer Studies/Computer Science high school teachers. As well as ideas on how to teach ComputerStudies/Computer Science at the secondary school level, there are lesson ideas, timelines, sampler assignments, tests and, worksheets in the book. Particularly useful is the section at the end on frequently asked questions (and the author's answers) by members of the class over the last decade. There is an updated version available of the notes (2011). Geoffrey Kavanagh (a retired high school teacher/department head) has been the sole instructor of this course at OISE since 1998. To contact the author, send an email to geoffrey.kavanagh@utoronto.ca.