Part One The Issues. Development impacts, the community interest and the planning system. From betterment to development obligations. Development impacts and the developer. The law and the legal debate. Part Two The Practice. Development obligations in contemporary planning practice. The purpose and rationales for agreements. The negotiation and management of obligations. Implications. Regulation through negotiation: a systematic approach. Appendix 1.The study approach. Appendix 2 Index of legal cases. References. Index.