How Good Is Good Enough: Negligence, Competence, And Quality: SPED

I'm preparing a talk for the Society of Piping Engineers and Designers at the moment, covering my experience as an engineer and expert witness with respect to issues for designers such as negligence and competence, quality management, good and best engineering practice. I've written quite a bit about different aspects of this before, and had quite a few assignments which involved forming opinions about these things. This is however the first time I have put all of the different aspects together.