This ebook presents significant new contributions in a deeper insight of the 'lean' and 'agile' philosophies, or approaches in, and to, organizations. It could be noticed that the controversies of the issue 'lean vs. agile' still remain. However, it could be said that an eventual further investigation in the phenomenology of 'lean' and 'agile' will be more informed after consideration of the results presented in this ebook. This ebook contributes to the higher levels of the "e;theories of 'lean' and 'agile' and their mutual relationship, namely to the Theories about the internal processes of 'lean'/'agile' users, General 'lean'/'agile' theories , and Epistemology of 'lean'/'agile'.