The change toward competence-based education has implications for teachers as well as school management. This study investigates which professional development activities teachers undertake related to this change and how these activities differ among schools with various human resource (HR) policies. Two types of HR policy were involved: (1) a government-enforced, national system of Integrated Personnel Management and (2) a voluntary, integrative approach of Schooling of teachers, Organizational development of schools and teacher training institutes, Action- and development-oriented research, and Professional development of teachers. Semi-structured interviews with 30 teachers in nine schools with different HR policies were held and analyzed both qualitatively and quantitatively. Findings show that teachers undertake professional development activities in five categories: "maintaining knowledge base", "applying and experimenting", "reflection", "collaboration", and "activities indirectly related to teaching practice". Teachers' professional development activities were found to be relatively similar across schools with different HR policies. It is concluded that neither government-enforced nor voluntary HR policies seem to play much of a role in the participation by teachers in professional development activities. Implications for further research and school practice are discussed. (Contains 5 tables.)