According to the Zanzibar Environmental Management Act No 3 of 2015, an Environmental Impact Assessment (EIA) / Environmental Social Impact Assessment (ESIA) must be carried out by a recognized experts or firms, authorized to conduct an ESIA/EIA in Zanzibar. The firm or an expert is required to fill in registration to apply for recognition by the Zanzibar Environmental Management Authority (ZEMA). ESIA/EIA must be conducted before the commencement of any investment that involves construction works.