... was declared a national language and a language of instruction in primary schools while English was declared a co-official language and it was supposed to be taught as a compulsory subject in ... undertaken on the language -in- education (Tibategeza, 2009; Swila, 2009; Rugemalira, 2005; Rubagumya, 1991; Mlama and Materu, 1978) have advocated a switch to Kiswahili as a language of instruction ... S., and Rajani, R. (2006), “Secondary education in Tanzania: Key policy challenges”, working paper no. 4, Haki-Elimu, Dar es Salaam. Swilla, I.N. (2009), “Language of instruction in Tanzania:...