I define personal knowledge as "what individual persons bring to situations that enables them to think, interact and perform." It can be observed only through a series of holistic performances, each involving several kinds of knowledge. Lifelong learning can be tracked through entries on learning trajectories . Professional practices grow through increasing recognition of situations, development of routines, reflection and discussion of new or complex problems. Most learning events are embedded in normal work, so access to learning depends on the nature of the work environment and the behaviour of those involved. The key factors affecting informal learning are appropriate levels of challenge and support, confidence and commitment, and personal agency . These factors, in turn, are influenced by the allocation, structuring, and perceived value of the work. Managers should be appraised on their crucial role in developing learning.