When we are used to "sequence or process thinking" we find variabilising is difficult. We find it easy to identify what matters but not the precision of what exactly.
To help with this I am giving the wording of some common variables-
Quantity of Level of Number of Quality of Appropriateness of Clarity of Pressure of/for/on Appreciation of Motivation for Cost of Revenue from Desired xxx Target xxx Gap between actual and target Preference for Attractiveness of Effectiveness of Ability to Success of Perceived Value of