The essence of an assignment in managerial organizations is that a subordinate is expected to use his/her capability to overcome the un-anticipatable obstacles that inevitably arise in working towards a goal.
The time-span of a role can be thought of in terms of the longest periods of time during which a subordinate’s tasks require him/her to be using his/her discretion in coping with the inherent uncertainties and complexities of each task.
All work requires that the individual doing the work must continuously balance the pace at which he or she is working and the quality of the output produced; i.e. must work just quickly enough and just well enough: not so quickly as to produce substandard quality; and not so preoccupied with quality as to be too slow.