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This paper presents the best compromise three‐level constant stress accelerated life test plans for Weibull distributions with different censoring times. The best compromise test plans choose the stress levels, test units allocated to each stress and censoring times to simultaneously minimize the asymptotic variance of the MLE of the mean log life at design stress and total running time. This paper also compares the test plans with existing three‐level test plans and concludes that the best compromise test plans (1) have less asymptotic variances, (2) are more robust and (3) are more cost‐effective, than the existing three‐level test plans.

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