Deri ap John Llewellyn Davies 
BGI Strategy On A Page 

This book is not a one-time read. It will be your compass and constant companion as your business evolves. Unlike most books on strategy, this is highly engaging, as it combines theory with case studies and is filled with images and practical exercises. It asks incisive questions to help you get to the heart of what your business is about and where you are headed. It ensures that you align with your values (a common source of problems in finding the right people both in terms of staff and customers), and it holds you accountable.