SIL-3, SIL-2, and Unicorns SIL-3, SIL-2, and Unicorns By Mark Johnson|2019-12-22T21:55:13-07:00December 22nd, 2019|0 Comments Share This Story, Choose Your Platform! FacebookXRedditLinkedInTumblrPinterestVkEmail About the Author: Mark Johnson Mark Johnson is the IT Manager and Webmaster for Process Improvement Institute.