This document contains four papers from a symposium on self-directed workplace learning. "Self-Directed Work Teams: Implementation and Performance" (Marcel van der Klink, Hilde ter Horst) discusses the results of a study examining the implementation and effects of self-directed work teams in a land register office and the role of the department's human resource management department in the teams' implementation. "Mature Self-Directed Work Teams: An Investigation into Training and Development" (Mary-Jane Willis, Patricia E. Boverie) reports on a study in which management and teams in companies throughout the United States were interviewed to identify and analyze the training received by mature self-directed work teams in manufacturing environments. Differences and dynamics in organizing and improving learning systems are explored through a study of two learning system development projects in "Improving Learning Networks. No 'One Best Way' for Developing Learning Systems in Organizations" (Loes E.C.M. Tijmensen, Ferd J. Van der Krogt). "Learning-project Structures in Different Work Types: An Empirical Analysis" (Rob F. Poell) details a study during which 16 learning projects conducted by 96 participants in 3 different work types were analyzed and compared both qualitatively and quantitatively. (MN)