Systematic review of interventions to support reunification & associated outcomes

Systematic review

Systematic review of interventions to support reunification & associated outcomes

Summary

This systematic review will explore the effectiveness of interventions designed to support reunification and its associated outcomes both pre- and post- reunification. It aims to understand how these interventions can be best targeted and delivered, identify the characteristics of effective practice, and examine the barriers and enablers to successful implementation.

This project will involve a rigorous mixed-methods systematic review of reunification interventions, combined with primary qualitative research that will help to embed lived experience (protocol forthcoming). Together, this research will inform a Foundations Practice Guide on reunification interventions and practice. 

Who, what, why and how?

Reunification refers to the return of children to their birth parents following a period in out-of-home care. It plays a critical role in achieving permanence for children, but gaps remain in the evidence base regarding effective practice and the contextual and demographic factors that influence effectiveness.

Foundations has commissioned the National Children’s Bureau to conduct a systematic review which aims to identify and describe:

  • Interventions which have been shown to be effective in supporting reunification and achieving long-term permanence in children aged 0-18 who have experienced time in out-of-home care.
  • Practice elements that are shared by effective interventions and observed to contribute to intervention effectiveness, covering both content and delivery characteristics
  • Evidence about for whom, and in which contexts, circumstances and combinations the identified interventions and practices have the highest likelihood of being effective
  • Information relevant for the successful implementation of interventions, practices and programmes within the UK context.

The review will focus on Children aged 0–18 years old who are returning home from care. All efficacy-based studies will be either randomised controlled trials or quasi-experimental design. Outcomes of interest include child safety, child wellbeing, family relationships, and parental wellbeing.

Included literature is not restricted by country, however, the review will place importance on the applicability of findings to the UK context, particularly in relation to whether interventions can be implemented in the UK.

Taking into account equality, diversity, inclusion and equity (EDIE) is crucial in this systematic review. To achieve this, evidence will be mapped and coded using PROGRESS-Plus as well as following guidelines set out by PRISMA-E.

Research Questions

RQ 1 – What works

  1. Which interventions or services are most effective in improving reunification outcomes among families with care-experienced children aged 0–18?
  2. Under what conditions do these interventions achieve the best results?

RQ 2 – For Whom?

  1. How do the effectiveness and applicability of reunification interventions vary across different family demographics, contexts, and care experiences?
  2. What models of reunification are most effective for specific populations (e.g., families facing financial instability, ethnic minority groups, or families in urban versus rural settings)?

RQ 3 – How and why?

  1. What are the key practice elements and components of successful reunification interventions?
  2. How do these elements contribute to the stability, safety, and long-term well-being of families and children?

RQ 4 – Implementation

  1. What barriers and enablers impact the successful implementation of reunification interventions?
  2. How can these insights inform scalable, sustainable models of practice?

Evaluation partners

National Children's Bureau

Due Date

This project is due to be completed by February 2026.
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Evidence synthesis protocol: Systematic review of interventions to support reunification & associated outcomes

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Cost ratings:

Rated 1: Set up and delivery is low cost, equivalent to an estimated unit cost of less than £100.

Rated 2: Set up and delivery is medium-low cost, equivalent to an estimated unit cost of £100–£499.

Rated 3: Set up and delivery is medium cost, equivalent to an estimated unit cost of £500–£999.

Rated 4: Set up and delivery is medium-high cost, equivalent to an estimated unit cost of £1,000–£2,000.

Rating 5: Set up and delivery is high cost. Equivalent to an estimated unit cost of more than £2,000.

Set up and delivery cost is not applicable, not available, or has not been calculated.

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Child Outcomes:

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Supporting children’s mental health and wellbeing: Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient.

Preventing child maltreatment: Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient.

Enhancing school achievement & employment: Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient.

Preventing crime, violence and antisocial behaviour: Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient.

Preventing substance abuse: Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient.

Preventing risky sexual behaviour & teen pregnancy: Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient.

Preventing obesity and promoting healthy physical development: Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient.

Evidence ratings:

Rated 2: Has preliminary evidence of improving a child outcome from a quantitative impact study, but there is not yet evidence of causal impact.

Rated 2+: Meets the level 2 rating and the best available evidence is based on a study which is more rigorous than a level 2 standard but does not meet the level 3 standard.

Rated 3: Has evidence of a short-term positive impact from at least one rigorous study.

Rated 3+: Meets the level 3 rating and has evidence from other studies with a comparison group at level 2 or higher.

Rated 4: Has evidence of a long-term positive impact through at least two rigorous studies.

Rated 4+: Meets the level 4 rating and has at least a third study contributing to the Level 4 rating, with at least one of the studies conducted independently of the intervention provider.

Rating has a *: The evidence base includes mixed findings i.e., studies suggesting positive impact alongside studies, which on balance, indicate no effect or negative impact.

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