This might be useless but I thought that anybody considering to improve his purchasing performance would look after a consulting firm to make a strategic sourcing methodology deployment faster. So, if it is good for employees to work in those firms, it might be good as well for the customers…not sure this makes really sense, but anyway, here is where I found the info and below is the ranking:
1. Bain 6. KSA 2. McKinsey 7. PRTM 3. Point B 8. Mercer (MOW) / (MMC) 4. BCG 9. Diamond 5. Monitor 10. Huron