For UX researchers: interviews, surveys, and usability tests that change what ships.
Reach for this when you own a research question end to end and need the output to actually move a product decision - not sit in a deck nobody acts on. It carries you from study design (non-leading interview guides, unbiased surveys, defensible usability test plans) through synthesis (themes, Jobs To Be Done, evidence-based personas) to a stakeholder readout that leads with the "so what" and a confidence level. Every skill encodes senior-researcher defaults - bias traps caught before fielding, insights tied to participant counts, recommendations specific enough to disagree with.
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Arranged in the author's recommended order. Walk through them in sequence, or open any one on its own.