Provides an overview of several of the most influential theories and models which are used to guide current health promotion practice. Based around the premise that the use of theory can help achieve a better fit between problem and program, this guide has been written with an emphasis on accessibility and brevity. Readers are given an explanation of the main elements of each theory, followed by a commentary outlining the relative strengths and weaknesses of the theory. Recommendations for futher reading along with helpful tables and figures are also included.