On Optimality of Stepdown and Stepup Multiple Test Procedures
  Consider the multiple testing problem of testing k null hypotheses, where the unknown family of distributions is assumed to satisfy a certain monotonicity assumption. Attention is restricted to procedures that control the familywise error rate in the strong sense and which satisfy a monotonicity condition. Under these assumptions, we prove certain maximin optimality results for some well-known stepdown and stepup procedures. 
E. L. Lehmann, Joseph P. Romano and Juliet Popper Shaffer