Dear Housam,
You are asking an excellent question. We frequently get similar questions from our PM Simulator LiveFeedbackTM feature.
The thing is that the PMBOK® Guide does not really clarify what documents require change request to be issued in order to modify them and what documents do not require it. As you and Michael correctly mentioned, it just says “any document”. But this is not what really happens. Well, the PMBOK® Guide does differentiate between Project Management Plan and Project Documents. Please take a look at the table in the PMBOK® Guide, Fifth Edition, page 78. Project Management Plan (with all its subsidiary plans and baselines) is considered to be a controlled document, while all the rest are non-controlled documents. As a rule of thumb, if a change will require a modification to any of the project management plan documents (controlled documents), then a formal change request should be issued and submitted to the Change Control Board (CCB) approval. However, if the change will affect non-controlled document, for example Issue Log (as a result of some issue that a project manager added), then no change request is required.
Having said that, some cases will require a change request to be submitted even if they touch project documents only. It will heavily depend on the question, on how it’s worded, and what is its context. For example, milestones list is a project document. However, if any milestone is required to be changed, most likely it will require the project schedule (another project document) to be changed, which, in turn, most likely will require a change to the schedule baseline, which is part of the Project Management Plan. And, therefore, a change request will have to be issued.
So, it all depends on the question.
On the flip side, if eventually a change request was issued and approved, project documents are likely to be updated in many cases (you can see that project documents update is one of the outputs from many processes). Again, which document and how it should be updated, will depend on the particular question.
Hope it clarifies.
Regards,
Stan Po, MBA, PMP, PMI-ACP, CSM, CIPP
Product and Program Manager
OSP International LLC