At the bottom of the pyramid is: ‘Practitioner wisdom/expert opinion (e.g. SERC/Cutting Edge webpages, JGE commentaries, In the Trenches articles)’. In the next stage of the pyramid is: ‘Qualitative and quantitative case studies (e.g. single course/institution, single method used, instrument is site specific, non-diverse study population, author/researcher may be curriculum developer/implementer).’In the next stage of the pyramid is: ‘Qualitative and quantitative cohort studies (e.g. multiple courses/institutions, mixed-methods, broadly applicable instruments used, examine diverse pop., steps taken to minimise bias).’ In the next stage of the pyramid is: ‘Meta-analyses of data in published studies.’ And at the top of the pyramid is: ‘Systematic reviews’. Outside of the pyramid there is an arrow going from the bottom of the pyramid to the top with the following label: ‘Increasing: data aggregation/synthesis, size or depth of study, generalisability and strength of evidence.’