As a rational-emotive therapist, working in the National Health Service, I often have to give my clients an introduction to the overall philosophy. I have taken to recommending this book, as it is clear, wide-ranging and inexpensive. The first chapter gives the basic ideas, then there are seven chapters on particular emotional problems - anger and hostility, depression, guilt, anxiety and worry and so on. Clients can thus read just the parts that apply to them - which is very useful! The summaries at the end of each chapter are another useful feature.
My main reservation is that, while some readers are swept away and love the style, others are turned off by it, finding it too repetitive, or dense, or technical. Nevertheless, I give this four stars for being the best book for the purpose. If you want to recommend this to your clients (or get it for yourself!) you can always supplement it with a more detailed treatment of the area of interest - once again, look for the names of Windy Dryden or Paul Hauck and you won't go far wrong.