Searching only the bare term ‘identity’ maximizes recall but imports off-topic document research.

Evidence

Since we wanted to include all conceptualizations of identity (sensitivity), but avoid literature on identification documents and policies (specificity), we decided to include the single search term “identity” (identit*) without further determination (i.e. social identity, identity formation, identity threat, etc.). — Lea Echelmeyer, Anne-Marie Slotboom, and Frank Weerman, The Putative Effect of Identity on…, 31

Categorization

• XREF: Methodological mirror of any systematic review: the sensitivity-specificity tradeoff determines what the evidence base even can contain.