Water Tank Littles Law Published on June 5, 2015 in A Eulogy for Little’s LawFull resolution (1053 × 510) Water Tank Littles Law Illustration of Little's law using a water tank. The colors indicate green W for waiting time or lead time, yellow Lambda for throughput in quantity per time, and red L for Inventory or current fill level. This work by Christoph Roser at AllAboutLean.com is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Please credit the image as shown below. For digital documents and web pages please do include the links as shown below. Thank you.By Christoph Roser at AllAboutLean.com under the free CC-BY-SA 4.0 license.