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This is a very good question, and I have the same question about law firms. How can clients ensure that they receive a quality service? The short answer is that it is often impossible for clients to verify the quality of a professional service e.g. accounting, law, management consulting. That is why large companies typically hire the firms with established well known brand names. McKinsey, BCG and Bain are the top three management consulting firms, and so large companies can feel confident that these consulting firms will provide a quality service. Consulting firms with a strong reputation will normally not want to risk damaging their reputation by doing a poor job. Bad news travels quickly.