Some literature concerning two-stage selection procedures is given. In general, the problem of selecting the Normal population with largest mean from k(\geq 2) Normal populations with a common variance is considered. Special attention is drawn to two-stage procedures with screening for selecting the best. Such a procedure consists of a combination of the subset selection approach and the indifference zone approach. The first stage is used for eliminating bad populations and the second stage is used to indicate the best population from the remaining part.