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We derive the power and sample size within two decision\u2010making frameworks. One is to claim the test intervention's benefit relative to control when superiority is achieved for the two endpoints <jats:italic>at the same interim timepoint<\/jats:italic> of the trial. The other is when superiority is achieved for the two endpoints <jats:italic>at any interim timepoint, not necessarily simultaneously<\/jats:italic>. We evaluate the behaviors of sample size and power with varying design elements and provide a real example to illustrate the proposed sample size methods. In addition, we discuss sample size recalculation based on observed data and evaluate the impact on the power and Type I error rate. 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