There has been significant growth in the recent years of MFIs which offer financial services to people who are financially excluded by main stream financial institutions. The MFIs use group lending methodology to replace the need of collateral in forms of land or log books with social collaterals. However, despite the advantages associated with group lending, challenges do exist that impact on loan repayment performance of groups. This book examines the determinants of repayment of group loans amongst MFIs in Nakuru County, Nakuru town.This includes business skills of group members, joint liability of group members, loan repayment terms, and demographic factors of group members.