Abstracts and taxonomy for 5,236 research methods from ScholarGate — the canonical, machine-citable reference library of research methods. Each record carries a definition, when-to-use guidance, strengths/limitations, quick facts, the method's place in a 3-level taxonomy, and its seminal sources (with DOIs/ISBNs where available). Deep mechanics/derivations are NOT included here; this is the openly-licensed abstract layer for reuse in RAG and research. Homepage: https://scholargate.app