"How do I give constructive feedback to a coworker?"

The goal is for them to leave the conversation better, not defensive. Some principles: 1. Private setting, always. Never in front of others. 2. Timely—don't save up feedback for months then dump it all at once. 3. Specific behavior, not character. Not 'you're careless' but 'I noticed the last two reports had data errors.' 4. Impact—explain why it matters: 'When the data is wrong, we lose credibility with the client.' 5. Curious, not accusatory: 'What happened there?' They might have context you don't. 6. Forward-looking: 'What would help you catch those errors next time?' The sandwich method (positive-negative-positive) is outdated and people see through it. Just be direct, kind, and focused on improvement.