Strategy involves determining long-term goals and adopting actions to achieve them. There are two levels of strategy - corporate and business unit. Corporate strategy focuses on what industries a firm should operate in, while business unit strategy focuses on how individual units will compete. Control systems must also align with strategy. Highly diversified firms require more arm's length control while related diversified firms benefit from resource sharing. At the business unit level, strategies include build, hold, harvest, and divest depending on industry lifecycle stage. Low cost, differentiation, and focus are common competitive strategies.