Patent ID: 7589851

Claim:
A job control system for controlling a job in a document processing system in which processing system a number of tasks is performed in a workflow, the job control system comprising: an input source with a user interface arranged to enable a user to define and change a set of job parameters; an identifier arranged to identify and mark dependencies of results of said job to said set of job parameters, wherein said results are selected from a group of intermediate results of said job and final results of said job, and wherein said set of job parameters are selected from a group of parameters for said workflow, parameters within said workflow, and parameters for individual task processors in a production plan defining processing of said job; a verifier arranged to verify, during job execution, a change in a particular parameter out of said set of job parameters, and to determine a condition if (a) a particular result out of said results and obtained before said change in said particular parameter is independent of said particular parameter, or (b) if an effect of said change in said particular parameter on said particular result is within a given limit; so that said particular result is still useable despite said change in said particular parameter; a memory arranged to store said particular result that is still useable; and a controller arranged to reuse said particular result only when said verifier has determined that the condition (a) or (b) has been met.