Evaluating any source material is a difficult skill and most students find it harder to discuss images than documents. It is important to give students processes by which to locate and evaluate appropriate material and then compare and contrast differing perspectives (generally a term applied to material classified as primary in this course) and interpretations (applied to historians' views) of the same event.
Some useful scaffolds are:
Opinion, Purpose, Value, Limitation: explained here: OPVL


Summarising, Contextualising, Inferring, Monitoring, Corroborating - explained here: SCIM-C


The proforma below can be found by Googling the 6Cs - the link is not consistent in taking you to the document.


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This acronym stands for Origins, Purpose, Values and Limitations.