Scientific and Technical Report No. 24 Performance-Based Contracts (PBC) for Improving Utilities Efficiency: Experiences and Perspectives is a compendium of articles written by members of the PBC taskforce. It focuses on new approaches without delegated management to private operator i.e. service contracts, consulting contracts, Alliance approach, public-public partnership. It also mentions new design and generation of more traditional PPPs, (MC, lease, concession), where a larger proportion of performance-based design is being applied. List of Contents: Performance Based Contracts - Setting the scene; PBC and Results Based Financing: the inverse approach; PBC and Energy Efficiency; Internal Performance Contracts: A Case of the National Water and Sewerage Corporation in Uganda; Performance-Based Service Contracts in Navi Mumbai; Financial Comparison of PBCs and Conventional Approach; Tegucigalpa PBC Case Study; Performance Based Contracts - Key Design Issues; NRW Reduction Optimization Framework; How to improve water services performance? Performance Based Contracts (PBC) and Regulatory issues; Peer-to-Peer Partnerships Operational for sustainable water services; Performance Based Contracts in Malawi: Teamwork Works; Performance based affermage contracts; Performance based Contracts, The Aroona Integrated Alliance Experience; Experience from Eastern Europe; NRW Performance Contract - Kingdom of Bahrain; The way forward and perspectives/trends