Intervention Tool
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About this tool
A single, accessible and trusted entry-point to current body of evidence
The Tool provides one-page overviews for each of the main interventions in homelessness. At a glance, the overviews give ratings for how reliable the body of evidence is, how cost effective the intervention is and what kind of impact it has for people experiencing homelessness. These measures represent an aggregate of the available studies.
Each overview will also provide a breakdown of the findings from the body of evidence, including detail on what the body of evidence says about how the intervention works, which population groups and outcomes it affects and where in the world the evidence comes from. As the evidence base grows, particularly with the inclusion of process evaluations (which will tell us about how interventions have been implemented), we will also be including a section that covers considerations for implementation.
Evidence standards
We are applying standards of evidence to each of our tools and maps, which have been developed with our partners The Campbell Collaboration.
Each intervention in the tool has a rating for strength of evidence, cost effectiveness and impact. These ratings represent and aggregate of the studies that have been conducted for that intervention. The thresholds for the ratings are as follows:
Strength of evidence
Considerable reliable evidence:
At least 3 RCTs or 5 other studies with combined sample size of at least 300
Some reliable evidence:
At least 2 RCTs or 3 other studies with combined sample size of at least 200
Limited reliable evidence:
At least 1 RCT or 2 other studies with combined sample size of 100
Insuffienct evidence available:
Any other number or combination of studies.
Cost effectiveness
To be determined.
Impact
++
3 or more RCTs showing positive effect. No studies showing adverse effect.
+
At least one RCT or 2 other studies showing positive effect and no study showing adverse effect.
+/-
At least 2 RCTs showing insigificant effects.
–
At least one RCT or 2 other studies showing negative effect and no study showing positive effect.
––
3 or more RCTs showing negative effect. No studies showing positive effect.
N/A
Insufficient evidence available or any other number or combination of studies and findings.
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