A computer-implemented method for identifying constraints to reducing consumable usage includes acquiring print job information for a set of print jobs submitted for printing by a set of users. A print job representation is computed for each of the print jobs based on features extracted from the print job information. Provision is made for user-annotation of the submitted print jobs with a task category and a constraint category. Each of a plurality of task categories represents a respective task with which the printing of a print job is associated. Each of a plurality of selectable constraint categories expresses a different reason for printing the print job. User-annotations are received for at least some of the submitted print jobs. The print jobs are clustered into clusters based on the print job representations and task category annotations. A representation of the set of print jobs is generated which represents reasons for printing of print jobs in at least one of the clusters, based on the users' constraint category annotations.