During the same period, there were 519 normal company collective agreements employing 553,500 people. Many of the largest companies, such as Philips, DSM or Shell, have company agreements. There is also a tendency for sectoral agreements to become framework agreements, with some of the detailed provisions being negotiated at company level. There are few rules for those who have the right to negotiate. The only requirement for trade unions is that the trade union has legal personality and that its rules give it the power to negotiate. This lack of restrictions on the bargaining freedom of trade unions faces similar freedoms for employers. Dutch employers and Dutch employers` organisations are not legally obliged to negotiate with trade unions. .