I was going to say something similar. Like in a story with a Problem of Evaluation the characters are driven to evaluate, but what you see the most is them acting on those evaluations and that causes them trouble. I think acting on an evaluation is the tail end of the process of evaluation, it’s part and parcel of the same thing, and I’m sure Deduction and Certainty work the same way.
Certainty could be someone motivated by their own certainty – “I was certain you were dead so I married someone else.”
Certainty could also be someone motivated to achieve certainty – “I want to be certain that everything will turn out as planned so I’ll make sure everyone follows the instructions; and if that’s not enough I’ll super-glue everything in place” (The Lego Movie).