What does a document controller do?
They keep the project record: the drawing register, issues and receipts, superseded revisions and the handover record.
Can a project engineer do document control?
Yes, on many projects they do it alongside their other work. It works best when one person owns the register and every issue goes out from it.
What goes wrong without one?
Typically, multiple versions of the register, subcontractors working from old revisions, and no reliable record of what was sent when a dispute arises.
Does software replace a document controller?
It replaces much of the clerical work, such as building the register and logging issues and receipts. Someone still has to own the process and check that it is followed.