A letter report issued by the Government Accountability Office with an abstract that begins "The Department of Homeland Security's (DHS) U.S. Customs and Border Protection's (CBP) schedules and Life-cycle Cost Estimates for the Arizona Border Surveillance Technology Plan (the Plan) reflect some, but not all, best practices. Scheduling best practices are summarized into four characteristics of reliable schedules—comprehensive, well constructed, credible, and controlled (i.e., schedules are periodically updated and progress is monitored). GAO assessed CBP's schedules as of March 2013 for the three highest-cost programs that represent 97 percent of the Plan's estimated cost. GAO found that schedules for two of the programs at least partially met each characteristic (i.e., satisfied about half of the criterion), and the schedule for the other program at least minimally met each characteristic (i.e., satisfied a small portion of the criterion), as shown in the table below. For example, the schedule for one of the Plan's programs partially met the characteristic of being credible in that CBP had performed a schedule risk analysis for the program, but the risk analysis was not based on any connection between risks and specific activities. For another program, the schedule minimally met the characteristic of being controlled in …