Finding out what works best for children and families is not easy. There is a lot of evidence available, but it can be hard to know how reliable it is. This means it can be difficult to decide on the right kind of support for children and families.
The Guidebook aims to change this. It is free and easy to access. It gives clear information to help you choose which interventions to put in place locally, and makes it easier to use reliable evidence in the design and delivery of support for children and families.
The Foundations Guidebook was launched in May 2025 as an updated version of the Early Intervention Foundation’s (EIF) Guidebook.
It contains information on existing research on over 130 interventions with at least preliminary evidence of improving children and families’ outcomes.
The Guidebook provides reliable evidence to support decision-making across the spectrum of early intervention, services for children and families, and children’s social care.
What’s new about the Guidebook
In April 2026, we published a revised set of evidence standards for the Guidebook Level 3 evidence rating. The revised evidence standards are more fully aligned with current best practice and those used in the Practice Guides, while at the same time being based on previous Guidebook standards.
We have also updated information on handling adapted versions of interventions; and how we are embedding EDIE throughout the assessment process, and in a new EDIE section on Guidebook intervention pages (for interventions added after May 2026). For more information see the FAQs and Guidebook Handbook v 2.0.
Finding out what works to support children and families
The Guidebook includes evidence on interventions that have been rated for their impact on children and families’ outcomes. Ratings are based on studies on the difference that the intervention has made for children and their families when they have been used before. For each intervention, the Guidebook can tell you:
- What the intervention does and who it is designed for
- How effective the intervention has been found to be (its impact)
- How confident you can be in the impact (evidence rating), as well as indicative costs.
The Guidebook also includes information about how to deliver interventions and summaries of the studies underpinning each intervention. More detail on the supporting studies is available in the Full Evidence Description.
Who the Guidebook is for
The Guidebook is designed to help local leaders, commissioners and practitioners, and researchers and policy makers, to use evidence when they make decisions about how best to support children and families. The Guidebook can help if you are:
- Planning or designing a new service
- Updating or improving an existing programme
- Applying for funding
- Commissioning or conducting research.
Combined with your knowledge and expertise, the Guidebook can help you decide which interventions are the best fit for the families and children you work with, in your local setting.
The Foundations Toolkit
Together, the new Guidebook and the Practice Guides series (commissioned by the Department of Education and produced by Foundations) make up our free, online Toolkit for local decision makers and practitioners, and national policy makers and researchers.
The Toolkit offers a complementary set of tools: the Guidebook has information about interventions that make a difference to children and families’ outcomes, and the Practice Guides have recommendations about how to put evidence-based support into action.