US firm Seyfarth Shaw use of Lean Six Sigma principles to understand and refine legal process is becoming increasing well known. This article by its chairman is a good introduction to how the firm operates and the commitment that sits behind it.
The comments - and concerns over making law too much of a process - are worth having a look at too.
If the recent recession teaches anything for the legal industry, it is this: The changing demands of our clients require the legal services profession to find different paths to deliver value to those who buy our services. Lawyers today should be asking themselves nontraditional questions: how to apply resources more effectively, to shorten cycle time and lower the cost of their work product and other deliverables, while raising the level of service. In the end, your client will reward you by giving you more work across more areas, and your relationship will deepen.