This book borrows from the school of urban political economy and a preexisting political science theory called the ecology of games to create a consistent and orderly conception of the salient practice areas and issues in the partial hospitalization program and intensive outpatient program (PHP/IOP) settings. The focus of the book is on understanding what will create successful, sound, and sustainable program delivery in these settings. Each chapter is an exploration of the puzzle found in each practice area or cohort and the game or set of strategies used to address the puzzle. The first chapter reviews the theoretical nature of the PHP/IOP levels of care and the recurring theoretical themes and paradigms in the book. Chapter 2 focuses on team work, and discusses the ongoing cooperative game of providing a therapeutic milieu based on setting up and maintaining order and eschewing control as a goal. Chapter 3 discusses the game of initial treatment planning which is a game of joining with the patient in as little time as possible. The fourth chapter discusses the game of identifying treatment progress while documenting the necessary acuity to buy more treatment time from managed care organizations (MCOs). Discharge planning is explained in the fifth chapter, which also provides a discussion on understanding the available aftercare resources. Chapter 6 discusses the game of group therapy as it is the primary treatment modality in the PHP/IOP setting. The book also talks about psychoeducation, regular adult cohorts, older adult cohorts, mentally ill patients, and children and adolescents.