A Rapid Assessment to investigate the worst forms of child labour (WFCL) in commercial agriculture, specifically tea plantations, was conducted by six researchers representing the Tanzania Plantations and Agricultural Workers Union (TPAWU). The assessment was conducted in two districts of Rungwe and Lushoto in Mbeya and Tanga Regions respectively and covered both medium scale tea farms and large estates. The intention of this study was to obtain mostly qualitative information on the worst forms of child labour on tea plantations, particularly in these two districts. The specific objectives for undertaking this study were to find out the causes of the worst forms of child labour in tea commercial agriculture, to assess the working conditions, and to examine the characteristics of the worst forms of child labour in terms of age, sex and number (magnitude and extent).