The student organization Verdandi in co-operation with the Scandinavian Institute of African Studies (NAI) organized a special seminar on Tanzania for Verdandi members going to make a study visit in Tanzania in the summer 1969. During the ten meetings of the seminar various aspects of Tanzania's development - political, social, cultural and economic - were studied and discussed in detail. One of the topics discussed in this seminar was Tanzania's political system. In connection with this presentation, a detailed description of the organization and structure of Tanzania's ruling party (TANU) was given by Mr Justin Maeda, the leader of the seminar. We are pleased to present a modified summary of Mr Maeda's presentation which we consider to be of great value to people interested in Tanzania.