Frequency Posted on 11th November 20151st September 2020 by ThePD (The Project Definition) Frequency is the number of times that a periodic function repeats and happens within a particular period. 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 General and tagged management. 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.