Alternation Posted on 1st November 201516th July 2021 by ThePD (The Project Definition) An Alternation is a situation of the repeated occurrence of two things in turn. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Management and tagged plan. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.