Characteristics of almost four thousand collective labour agreement contracts (CAO's) signed by the FNV union, concerning the period 1995 until 2004. The DUCADAM dataset contains more than thousand variables which can be divided into the following main categories: income and function, working hours and time-tables, pensions, various kinds of leave conditions, provisions for young employees, working conditions, environmental issues, education, social security, participation, quality of contracts, international issues, and meta cao characteristics.