COLLECTIVE AGREEMENTS AND INDI VIDUAL CONTRACTS OF EMPLOYMENT IN LABOUR LAW THE NETHERLANDS With thanks to Ivo van der Helm(Department of Labour law and social security law, University Utrecht) for his useful comment on a earlier version of this report.COLLECTIVE AGREEMENTS AND INDIVIDUAL CONTRACTS OF EMPLOYMENT IN LABOUR LAW : THE NETHERLANDS* * With thanks to Ivo van der Helm (Department of Labour law and social security law, University Utrecht) for his useful comment on a earlier version of this report