This is a ONE set of TWO full-color books. The difficulty of the exercises are increased gradually, creating a linear structure for individual practice. The exercises, performance monitoring and results control are solid foundations for improvement and enjoyable practice. Performance can be monitored by taking the relevant tests for each individual level or by comparing results with other players on the internet platform. Volume One (68 pages) covers the exercises for working your way through the first four Playing Ability Levels and Tests (PAT) and Volume Two (68 pages) covers the last four levels. Expert advice is provided. Available only as ONE set of TWO books. Just shipped in from Germany (They are in English!) there are only 9 sets available!