Teacher absenteeism constitutes a significant barrier to achieving quality education in many low- and middle-income countries globally, where teachers' school absence rates range from 3 per cent to 27 per cent. Tanzania Mainland has made significant progress in achieving universal primary education and improving the quality of education. Since 2002, access to primary education has expanded exponentially. Yet, quality of learning outcomes remains a challenge. One of the key factors for the provision of quality education is teacher attendance. While many reasons for teachers' absenteeism appear to be valid, such as lack of reliable transport and bad climate conditions, other causes are hard to justify, such as when teachers fail to prepare for lessons. Time to Teach (TTT) targets this knowledge gap. Its primary objective is to identify factors affecting the various forms of primary school teacher attendance and to use this evidence to inform the design and implementation of teacher-related policies. Specifically, the study looks at four distinct forms of teacher attendance: being in school; being punctual; being in the classroom; and spending sufficient time on task while in the classroom.