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...{{Cite|Collopy|2003}}; {{Cite|Remillard|1999}}; {{Cite|Schneider & Krajcik|2002}}). The interaction of these factors is complex ({{Cite|Lloyd|1999}}) and s ...might be most effective ({{Cite|Collopy|2003}}; {{Cite|Schneider & Krajcik|2002}}), especially where theories of PDK have been developed in discipline-spec