Error of Estimation Posted on 9th November 201527th July 2021 by ThePD (The Project Definition) Error of Estimation is an error made by using the equation that is a difference between an estimated value and the true value. 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 Controls and tagged estimate. 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.