This article questions whether the requirements demanded for effective perf
ormance in the field of development are sufficiently addressed through trai
ning that traditionally emphasizes acquisition of intellectual competence f
rom knowledge articulated in instruction-led teaching. Casting the task in
development training as the strengthening of the capacity of practise, the
author asks what kind of purpose, approach and focus in learning best respo
nds to the demands of practitioners working in the difficult circumstances
of the unknown. Three core concepts are introduced as underpinning an empha
sis in development training that makes learning developmental: meta goals,
experience-based problem solving and tacit knowledge. The conceptual interr
elationship of all three concepts bridges the gulf in practitioner developm
ent of the conflicting thought worlds between the tacit practice of develop
ment and the explicit understanding of that practice. Copyright (C) 1999 Jo
hn Wiley & Sons, Ltd.