TCRP Report 135: Controlling System Costs: Basic and Advanced Scheduling Manuals and Contemporary Issues in Transit Scheduling, is an update to TCRP Report 30: Transit Scheduling: Basic and Advanced Manuals and   addresses contemporary issues in transit scheduling. TCRP Report 135 provides information on available scheduling tools and techniques and their capabilities. Also, the report provides guidance to transit agencies on a variety of scheduling issues typically faced in a transit operating environment. The results of this research may be used by new or experienced schedulers, planners, operating managers, and chief executive officers.