A series of six focus groups was held with health promotion workers to expl
ore the meaning and experience of 'capacity-building', a term which is used
variously in the literature. The research is part of a participatory, prac
tice-based project to develop outcome indicators in capacity-building. Capa
city-building was defined as seeking to develop health promotion skills and
resources, and also problem-solving capability, at five levels: the indivi
dual; within health care teams, within health organisations; across organis
ations; and within the community. While workers had little difficulty in id
entifying outcomes of capacity-building, indicators of quality or good proc
ess were more difficult to articulate. This was partly because capacity-bui
lding was described as an invisible, even secret process. Capacity-building
is hidden from funders and administrators because it is not generally rega
rded as a legitimate project activity; that is, it is not directly linked t
o risk factor behaviours in priority areas such as cancer, heart disease an
d injury control. Capacity-building is also hidden from other workers in or
der to make it more effective. This is particularly the case with health pr
omotion workers working within what they perceive to be hostile climates, s
uch as health care settings experiencing funding cut backs. The invisibilit
y of practitioners' capacity-building work has implications for quality con
trol, guiding theory, practice ethics, peer support, worker morale and fund
ing mechanisms in health promotion.