The document discusses some common reasons why mergers and acquisitions often fail. It provides examples of mergers that failed, including HLL-TOMCO due to differences in valuation techniques, Jet-Sahara due to overvaluation and lack of a robust business model, and Glaxo-Wellcome-Burroughs due to high pay differentials between workers causing integration issues. It then lists some common sins that can cause M&A to fail, such as lacking clear guiding principles, ground rules, stakeholder communication, aggressive synergy targets, and cultural integration plans.