Prime Minister Costas Simitis yesterday called on trade unions to play their part, in tandem with the government and the ruling PASOK party, to help carry the country through the changing and difficult economic circumstances it now faces. Our forces in the trade unions and social bodies must understand that the changes underway in the economy and the mode of production require the adoption of a new series of demands and the formulation of new proposals. In order to implement our values we must use new means, he told PASOK-affiliated trade unionists. Simitis said that trade union collaboration was essential to jointly formulate urgent and reliable solutions to social security reform. Many confuse dialogue with negotiation. This is a mistake. There is no negotiation between working people and the PASOK government. There is alliance and cooperation, he emphasized.