Over at Manage Smarter, Margery Weinstein shares some stats or results that companies may expect from an effective Lean Six Sigma initiatives.
Let me share the stats with you:
- Cost to produce down 20-plus percent.
- Inventory down 50% to 80%.
- Lead times reduced 60 to 90-plus percent.
- Cost of quality down 50% to 70%.
- Throughput increased by 10%.
- Revenue and earnings growth at least twice those of your competition.
Good numbers that should convince companies more to go into Lean Six Sigma. 
Six Sigma : Your Resource for Strategic Management. Meikah Delid. Eversun Software 2006.