The basic sequential search model and its ramifications

Where the sequential method is applicable, it leads to remarkable savings because the test can be stopped as soon as sufficient evidence is available. But this is of no less interest from a theoretical point of view, because the decision whether to stop or proceed and how is based on the changing likelihood function of the experiment in progress. One seems almost compelled to return to the Bayes formulation since so many of its elements have reappeared spontaneously and of necessity.