Dr. William Edwards Deming is well known to most quality improvement professionals around the world, and if you're in healthcare, but you don't know anything about him, it's not that surprising.  (Wikipedia entry on him here if you need background.)  After all, his principles for quality improvement are, only in these last 15-20 years or so, really catching on in healthcare.  Take a look at these five classic Deming-esque teachings on quality improvement, and see which ones you use.  As an aside, #2 is extra-special in my opinion...because if you can measure it, but you measure it wrong...well, that's why the tools and safeguards in Lean Six Sigma are so important to avoid misguided and potentially damaging quality improvement efforts.