Begin by rewriting lofty hopes into concrete, observable shifts that appear within the hour. Instead of “reduce litter,” specify “remove and bin thirty visible pieces on one block.” Define where, when, who verifies, and acceptable evidence types, ensuring volunteers feel progress and evaluators see change without lengthy analysis.
Select indicators that match the tiny timebox and still matter to people affected. Fewer, clearer measures beat sprawling dashboards. For quick acts, track counts, before-after photos, micro-surveys, or confirmation messages received. Note verification difficulty explicitly, trading sophistication for reliability and consistency that survive real sidewalks, rain, schedules, and phones with dying batteries.