I just received my copy of the SME e-Newsletter of Lean Manufacturing called Lean Directions which had an outstanding article on Visual Work Instructions. Most of the time, articles I read on lean are long on fluff and short on substance. This article has some excellent detailed points aimed at the lean practitioner.
Check out Dr. Steven Blackwell's article "Shorter Text for Visual Work Instructions". It follows the same concepts I have written about on making documents shorter, concise and to the point to improve use and understanding (ref posts "Visual Work Instructions Basics" and "When it Comes to Standard Work Instruction Computer Files, Size Matters" and "Make Every Word Count in Quality").
Great guidelines to create better visual work instructions like sentence structure and making it simple!
While at this site, just sign up for a free subscription to SME's Lean Directions. It's a great Lean Resource.