This book unlocks the mysterious subject of past practice. One of the most powerful principles in labor relations and is one of the most difficult to master. This book explains the subject in a practical manner for unions and stewards
A concise guide to workplace rights based off of past practices, defined here as "consistent course of conduct that has been followed for a substantial period of time with the knowledge and acceptance of both management and the union." Clear communication and routine recognition of actions (on all sides) would prevent a lot of workplace friction, but it's nice to learn about what protections are available when things go awry.