Table 1. Selected criteria.

Answerability	How answerable would this research question be? (e.g. is it feasible to answer within the given context and timeframe? Is it ethical?)
Efficacy	How likely is it that this research would lead to efficacious interventions/approaches/policies? (e.g. is it likely to produce the desired outcome in ideal conditions?)
Deliverability	How likely is it that this research would lead to deliverable impactful interventions/approaches/policies? (e.g. will the intervention/ approach/ policy be affordable, cost-effective, deliverable at scale and achieve required coverage? Is the research generalizable?)
Fills a gap	Will this research question fill a key gap in knowledge that is required to prevent wasting?