The current study explores what particular leader behaviour enhances the innovative behaviour of employees. Last year we made an extensive literature review. We also performed a number of in-depth interviews with managers and entrepreneurs to explore if and how they stimulate innovative behaviour (see De Jong & Den Hartog, 2003). This resulted in an inventory of thirteen types of leader behaviour that may affect employees suggestions and implementation efforts. We also identified some control variables that are likely to affect whether employees generate and implement ideas, including an innovative workclimate and having frequent external contacts.