Process Improvement Institute | Guidelines for Hazard Evaluation Procedures (PHA/HAZOP) Book Process Improvement Institute | Guidelines for Hazard Evaluation Procedures (PHA/HAZOP) Book By Mark Johnson|2020-01-14T08:31:46-07:00January 14th, 2020|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.