Multiple lines and levels of evidence

Synonyms:
mlle

Multiple Lines and Levels of Evidence (MLLE) reviews the evidence for a causal relationship between an intervention and observed impacts in terms of its strength, consistency, specificity, temporality, coherence with other accepted evidence, plausibility, and analogy with similar interventions.

Previously used in public health and now used in natural resource management impact evaluations, a wide range of evidence from different sources is reviewed by a panel of credible experts spanning a range of relevant disciplines to identify consistency with the theory of change and to identify and explain exceptions.

Resources

  • Template: Recording assessment using multiple lines and levels of evidence (mlle) criteria

    This template can be used when doing a Multiple Lines and Levels of Evidence analysis, to record all the lines of evidence available for each evaluation question.

  • Causal criteria methods manual

    This manual details the 8-step causal criteria framework, a method that can be used to integrate information from different data sources.

  • What counts as good evidence?

    This paper, written by Sandra Nutley, Alison Powell and Huw Davies for the Alliance for Useful Evidence, discusses the risks of using a hierarchy of evidence and suggests an alternative in which more complex matrix approaches for identifying evidence qu

  • Eco-evidence tool

    Eco Evidence is a useful tool for anyone required to review the literature on a specific topic of interest, especially those exploring cause-and-effect questions from existing literature.

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