This map is also known as 'why things work or not'. The purpose of this Evidence and Gap Map (EGM) is to provide easy access to the available evidence on qualitative process evaluations studies that examined factors which help or hinder the successful implementation of homelessness interventions.

In the map the rows are intervention categories and the columns pertains to implementations issues on what are called 'barriers and facilitators'.

The cells of the table contain a bubble whose size is proportional to the number of studies reporting that implementation issue for that intervention. There are separate bubbles for barriers and facilitators. The map also has filters for region and place, allowing the evidence to be restricted to specific countries, regions. The interactive platform allows users to click on entries to see a list of studies for any cell in the map. Clicking on study names shows the database record for the study with a link to the study itself.

The map has three version Bubble, heat and donut which are self-explanatory.

This EGM also identifies key ‘gaps’, cells which do not have any bubbles, indicates there no evidence.

The report describing the map can be downloaded here.

This map was commissioned by the Centre for Homelessness Impact and created in partnership by Campbell Collaboration and Centre for Homelessness Impact.