John Kleeman of Questionmark put up a nice post in which he presents an outline of how PwC blueprints their tests.
PwC use a five-stage model for diagnostic assessments: Assess, Design, Develop, Implement and Evaluate. The Design phase includes blueprinting, starting from learning objectives. PwC rate all their learning objectives by Criticality and Domain size, as follows:
1 = Slightly important but needed only once in a while
2 = Important but not used on every job
3 = Very important, but not used on every job
4 = Critical and used on every job
1 = Small (less than 30 minutes to train)
2 = Medium (30-59 minutes to train)
3 = Large (60-90 minutes to train)
The number of items they use for each learning objective is the Criticality multiplied by the Domain size. So for instance if a learning objective is Criticality 3 (very important but not used on every job) and Domain size 2 (medium), they will include 6 items on this objective in the assessment. Or if the learning objective is Criticality 1 and Domain size 1, they’d only have a single item.
Click on the link below to read John’s post.