" Consistency: The strategy must not present mutually inconsistent goals and policies. Consonance: The strategy must represent an adaptive response to the external environment and to the critical changes occurring within it. Advantage: The strategy must provide for the creation and/or maintenance of a competitive advantage in the selected area of activity. Feasibility: The strategy must neither overtax available resources nor create unsolvable subproblems. "

― Henry Mintzberg , Strategy Safari: A Guided Tour Through The Wilds of Strategic Management