This document provides a checklist and overview for conducting due diligence for buy-side mergers and acquisitions (M&A). It discusses common M&A pitfalls such as improper target identification, overpaying, unrealistic synergies expectations, and failure to integrate. The checklist covers understanding corporate strategy, performing due diligence, post-acquisition integration considerations, valuation approaches, acquisition financing terms, engaging potential targets, and post-merger success factors. Financial due diligence areas are also outlined. The document aims to help practitioners avoid common M&A failures by taking a logical approach and thorough due diligence.