In this chapter we illustrate several ways in which geomechanical issues affect the success of particular well completion strategies. As it is impossible to cover the wide range of possibilities for each of the active unconventional plays, we attempt to illustrate several fundamental principles affecting completions that are related to the other topics we consider in this book. We present several instructive case studies and review modeling results that illuminate several ways in which seemingly subtle geomechanical principles have a significant effect on hydraulic fracture growth and distribution of proppant in hydraulic fractures. While the periods of trial-and-error testing used to inform optimal well completion parameters are critically important, it is equally important that the testing be done in a context in which the maximum amount of information as possible is obtained.