As far as we know regarding JOC (job order cost) , the  output  of  any  job  can  be  a  single  unit  or multiple  similar  or  dissimilar units. With multiple outputs, a unit cost can be computed only if the units are similar or if costs are accumulated for each separate unit (such as through an identification number). 
For example, Seagull Technology produces compact disk drives to the specifications of a variety of companies including Compaq. Seagull can determine  the cost per disk drive  for each company by accumulating  the costs per batch of homogeneous products in different production runs and treating each production  run as a  separate  job.  In  such cases, production costs of each  job batch can be commingled because the units within the batch are not distinguishable and the total cost can be averaged over the number of units produced in the batch to determine a cost per unit. If the output consists of dissimilar units for which individual cost information is not gathered, no cost per unit can be determined although it  is still possible  to know  the  total  job cost.
Remember eventhough actual overhead may be assigned to jobs, such an approach would be less customary because total overhead would not be known until the period was over, causing an unwarranted delay in overhead assignment. Activity-based costing can increase the validity of tracing overhead costs to specific products or jobs.
To eliminate the need for repetition, units should be read to mean either products or services because job order costing is applicable to both manufacturing and service companies. For the same reason, produced can mean manufactured or performed.
Remember eventhough actual overhead may be assigned to jobs, such an approach would be less customary because total overhead would not be known until the period was over, causing an unwarranted delay in overhead assignment. Activity-based costing can increase the validity of tracing overhead costs to specific products or jobs.
To eliminate the need for repetition, units should be read to mean either products or services because job order costing is applicable to both manufacturing and service companies. For the same reason, produced can mean manufactured or performed.
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