The approach to tackling messy real-life situations known as Soft Systems Methodology (SSM) was developed in a 30-year programme of action research led by Peter Checkland. The approach is now used and taught around the world, and its development has been described in depth in four books published between 1981 and 1999, which are now regarded as classics in the field. Peter Checkland and John Poulter now present a concise, crystal-clear and definitive account of SSM written for anyone who wishes to use, teach, or learn about it. This account also corrects the misunderstandings about the SSM approach, which plague its secondary literature. Learning for Action first provides an overview of SSM and its use, then gives a detailed account of the techniques used within it. It also crisply summarizes many accounts of SSM in action in real situations in both private and public sectors, using the pattern: the situation; the use of SSM; outcomes, with references given to more detailed accounts. Also covered are the craft skills which practitioners develop, the theory underlying SSM, and the fundamental shift in thinking away from the systems approaches of the 1960s which its development signalled - namely the transition from 'hard' to 'soft' systems thinking.Checkland, Peter is the author of 'Learning for Action A Short Definitive Account of Soft Systems Methodology, and Its Use Practitioners, Teachers and Students', published 2007 under ISBN 9780470025543 and ISBN 0470025549.