Originally, we intended to allow the user to add a free number of categories to rank their tasks on. Based on the recommendation of G. Oana Costea, we scaled back to three categories to make sure the app wouldn't become a source of procrastination. We concluded based on experience that any third category should be associated with ease/difficulty (such as; simplicity/complexity, pleasing/displeasant, time consumption, energy consumption, distance, etc), since many recommendations would be based on starting with the easy or difficult tasks first.
We tested a comparison with filling rating questions ("how important do you rate this task?") compared to our individual sorting method ("which of these two tasks is more important?"). It turns out that there is a break-even point at 22 tasks at which rating questions and the individual sorting method takes the same amount of time, but the individual sorting method will deliver a much more granular result.
In the recommended time of filling a normal survey (20 minutes), users should in theory be able to rate 53 tasks across three categories.
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