Your question is Pitfalls in Concurrent Experiments. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
What are the most common experimentation pitfalls you encounter when running concurrent tests on the same user base?
Discuss how overlapping treatments can affect causal interpretation, statistical validity, and product decisions. Cover hypothesis structure, primary and guardrail metrics, randomization and analysis units, sample-size implications, monitoring, and mitigation strategies. Where assumptions are needed for calculations, state them explicitly and distinguish illustrative planning assumptions from observed results.