Making integration foundational in population health intervention research: why we need 'Work Package Zero'

Area of Science:

• Public Health
• Program Evaluation
• Health Services Research

Background:

• Complex population health interventions (PHIs) require robust evaluation methods.
• The timing and nature of integration within PHI evaluations are often unclear.
• Existing approaches may limit the utility of integration by applying it only at the evaluation's conclusion.

Purpose of the Study:

• To determine the optimal timing for integration in complex PHI evaluations.
• To identify effective methods for integrating analyses throughout the evaluation process.
• To provide guidance for researchers, funders, and stakeholders on integrating PHI evaluations.

Main Methods:

• A descriptive analytical approach was employed.
• Insights were derived from a dedicated working group on integration.
• A comprehensive review of relevant literature, including case studies and mixed-methods evaluations, was conducted.

Main Results:

• Conceptualizing integration solely for the end of an evaluation was found to be restrictive.
• Integration is more effective when viewed as an ongoing process starting at the evaluation's inception.
• Various methods support continuous integration, such as process tracing, realist evaluation, and contribution analysis.

Conclusions:

• Integration should be an early and continuous process within complex PHI evaluations, not a final step.
• This continuous integration can be conceptualized as 'Work Package Zero'.
• Clarifying the commencement of integrative methods benefits the PHI evaluation community and funders.