This workshop is for beginners and those wishing a refresher in instreamflow. It is designed to acquaint agency biologists, researchers and students to the realm of instreamflow. Thirty models and methods will be briefly reviewed. Primary emphasis will be on Instream Flow Incremental Methodology (IFIM). Now in use worldwide, IFIM is a decision-support methodology that provides a comprehensive technical framework for addressing the streamflow needs of fish and other living organisms within a river system. Over the years, field-testing and other refinements have led to many improvements in the original model, such as expansion to include long-term effects, and incorporation of the institutional environment as a major component of IFIM. The Physical Habitat Simulation System (PHABSIM) and Salmod are the two primary IFIM models used by fishery and water management agencies and have withstood the test of time and court proceedings. More contemporary models will be briefly discussed such as 2D flow models, IBM models, and others. Consideration will be given to holistic matters of stream management, such as including flows for channel shaping, sediment transport, recreation as well as instreamflow's for fish and wildlife needs.