To the PMP community, I request your support to clarify concepts or definitions of requirement, deliverable and criterion of acceptance, at what time you can talk about one or the other and their rel

So, you want to develop a pen. At the highest level, you can state:

"I need a pen that writes in black and can be erased"

It is a high-level requirement in can be stated in the Project Charter during the project Initiation.

Later during the Planning phase, you will elaborate on more detailed requirements of the pen. For example:

- The Pen should be able to write 10000 words.
- The pan should have a soft touch body,
- The pan should retract and hide the tip with a button.

These requirements will go into the Requirement Traceability Matrix.

Acceptance Criteria can be stated in WBS Dictionary, RTM, or Quality documentation.

It may say something like: "I will know the requirement of 1000 words is meat when QA team performs testing of 100 pens on different types of paper."

Requirements and acceptance criteria are developed during project planning.

Please let me know if this answers your question.