Editing Cognitive tutor (section)

===Design===

The complexity of Cognitive Tutor software requires designers to spend hundreds of hours per instructional hour to create the program.  Despite the time invested, the challenges associated with meeting the needs of the learner within the constraints of the design often result in compromises in flexibility and cognitive fidelity.<ref name="Aleven, 2010">{{cite book|author=Aleven, V.|year=2010|chapter=Rule-Based Cognitive Modeling for Intelligent Tutoring Systems|editor=R. Nkambou|display-editors=etal|title=Advances in Intelligent Tutoring Systems|publisher=SCI 308|pages=33–62}}</ref>

Practicality dictates that designers must choose from a discrete set of methods to teach and support learners.  Limited choices of methods, prompts and hints may be effective in supporting some learners but may conflict with the methods already in use by others.<ref name="Scandura, 2012"/> In addition, it is possible that learners will use the system of prompts and hints to access the answers prematurely thereby advancing through the exercises which may result in them not meeting the learning objectives.