Routing procedure is most difficult and complex for these production systems.
Routing in Batch Production Systems: Batch (Intermittent) type production system based organizations also make use (generally) of process type layout. The operations and their sequence differ from batch to batch. The route sheets require revision whenever production of the batch changes. Routing procedure is still difficult but relatively simpler as compared to job order production.
Routing in Mass (Continuous) Production Systems: These production systems do not present much problem in routing due to product type of layout. Here, machines are arranged according to the sequence of operations to be performed on the components. In view of the standardized products, the number of operations and their sequence can be standardized. The equipment is arranged in sequence with automatic material handling systems. Routing function becomes a routine and a mechanized function. Production requires special attention with regards to route sheets in the following cases:  Interruption in production flow due to certain factors like machine breakdown, power cuts, shortages of materials etc.  When it is necessary to train new personnel in the standard procedures of the job. Routing procedure is simplest in mass or continuous production system based manufacturing organizations. 212