Comprehend is the function of assuring that a new perceptual element is what was expected and in the form needed for continued processing. It involves both recognition and labeling or re-representing, as required. This interpretive function in general cannot be moved out into the E-productions. There is no way to produce new E-productions in the short term, in response to particular demands, and they cannot be controlled as a function of the task -- once there, they will just fire. So E-productions cannot be organized to be a task-responsive system. The application of this principle requires some care. E-productions, of course, are conditional, so they can have some task conditionality built in, but their conditionality is build in once and for all at the time of creation (which occurred long prior to the task under consideration).Forward to Tasking.Comprehension is performed by an operator. If a sufficiently complex comprehension is required, then this operator has to break out into an implementation space, but there are limits to the amount of processing that can occur for immediate-response tasks. The duration of comprehend increases with the complexity of the stimulus object -- what it takes to identify it and its task-relevant aspects -- and decreases with preparation, which is again the extent to which the comprehension task has been narrowed down to what is essential. How much preparation is possible depends on the details of the task.