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Comments on the editorial by Peter Griffiths & Ian Norman (see record 2013-10991-001). The editorial summarized many important points. The Medical Research Council guidance for the evaluation of complex interventions has been revised and updated. The process of developing and evaluating a complex intervention has several phases, although they may not follow a linear sequence. Experimental designs are preferred to observational designs in most circumstances, but are not always practicable. Understanding processes is important but does not replace evaluation of outcomes. Complex interventions may work best if tailored to local circumstances rather than completely standardized. Reports of studies should include a detailed description of the intervention to enable replication, evidence synthesis, and wider implementation. The editors recognized that many issues surrounding evaluation of complex …