There are two basic types of production systems: flow processes and intermittent processes. Flow processes include mass production and assembly production, which use standardized methods and machines to produce large volumes of standardized items continuously. Intermittent processes include job production, batch production, and project production, which are used to produce smaller volumes of varied products on a start-and-stop basis. Continuous production processes are also flow processes that run for long periods without stopping to produce high volumes of uniform outputs.