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.

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