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The last step in completing the outcomes logic map is to fill in the specific data you’ll need to collect to determine if you’ve achieved each outcome. “Specific” is key here: “blood pressure readings” is not as good as “self-reported blood pressure readings using a kiosk at the pharmacy.”

In the process of listing out the data you need, you’ll be able to identify information you can collect through your product itself and the information that you’ll need to get outside of your product. Anything that happens inside the product needs to be accounted for in the design requirements; for example, if you need to have users answer certain questions every two weeks, you’ll need to make sure those questions are included in the product, along with a scheduled prompt so that people answer them at the right times. Anything that happens outside of the product will need to be accounted for in other ways. I’ll cover some of those in the section on “Evaluating for Effectiveness” later in this chapter.