Case skeleton using P→A→R: client's problem, your actions, measurable result
CASE: [client/industry] Problem: [the pain the client had before reaching out] What was done ([role, timeline]): - [action] Result: [numbers: %, money, time — before/after]
A strong case = specifics: numbers, timelines, metrics. 'Built a nice site' — weak; 'checkout refactor: conversion 1.2%→2.8%, revenue +$40k/mo' — strong. NDA: generalize ('a top-3 delivery service') or get publication consent in the contract.