What we know
Plain-language evidence syntheses.
The registry is the raw evidence. These pages are the synthesis — what the experiments collectively show on each major intervention class, including where the evidence is strong, where it is contested, and what questions remain open. Each page links to every underlying trial.
What we know about SMS reminders in public-sector programs
Across vaccination, court dates, taxes, voting, and benefits — when do text-message reminders move behavior, and when do they fail?
10 experiments in this synthesis →
What we know about guaranteed and basic income pilots
Stockton, Finland, Manitoba, Kenya, and beyond — what randomized and quasi-experimental evidence says about unconditional cash to working-age adults.
7 experiments in this synthesis →
What we know about conditional cash transfers in LMICs
Progresa, Bolsa Família, BRAC graduation, and direct cash to the ultra-poor — what the strongest evidence base in development economics says.
4 experiments in this synthesis →
What we know about increasing vaccination uptake
From SMS reminders to small incentives to default scheduling — what raises vaccination rates and what produces precisely-estimated zeros.
4 experiments in this synthesis →
What we know about behavioral nudges in tax administration
Letter wording, social-norm framing, deterrence messaging, and form simplification — what raises tax compliance and what doesn't.
2 experiments in this synthesis →
What we know about housing-first and supportive housing
Pathways to Housing, At Home / Chez Soi, Denver supportive housing — what experimental and quasi-experimental evidence says about ending chronic homelessness.
5 experiments in this synthesis →
What we know about helping people show up for court
Court-date SMS reminders, redesigned summonses, and procedural support — what reduces failure-to-appear rates and the cascading harms that follow.
2 experiments in this synthesis →
What we know about home energy reports and behavioral conservation
Opower-style social-comparison reports, time-of-use pricing, and feedback interventions — how much energy do they actually save?
1 experiment in this synthesis →