This article deals with the issue of the most important postulates of the Round Table Agreement: legalization of independent trade unions, the introduction of the office of President, the formation of a Senate. As a result, political power was vested in a bicameral legislature (Sejm and Senat) and in a president. Solidarność became a legal political party. Free election to 35% of the seats in Sejm and a free election to the Senate was assured. The election held on 4 June 1989 brought a total victory to Solidarność (99% seats in Senate and all 35% seats in Sejm) and became the basis for the erection of the Third Polish Republic.