1) Corporate integration strategies involve combining activities related to a firm's existing business processes or expanding into adjacent businesses serving similar customers. 2) Horizontal integration is the acquisition of similar firms operating at the same stage, often for geographical expansion. It can reduce costs and increase bargaining power but provides little evidence of value creation. 3) Diversification adds new, distinct businesses to leverage competencies and resources, though unrelated diversification risks unsuccessful ventures due to dissimilar skill sets.