A Document Allocation Matrix maps each discipline and document type to the work package type that carries it, and document control consults it every time a placeholder is created. It turns allocation into a lookup that every discipline performs the same way.
What It Decides
Every document in the master document register and the project document system is assigned to one work package at the moment its placeholder is created. The assignment is an EWP, a VEWP, an FEWP, or not applicable, and unassigned documents are not permitted. Only documents required for construction execution are allocated to a package, which keeps engineering studies and internal calculations out of the field set. Project-wide documents such as P&IDs, specifications, standards and typical details sit under a general construction work area reserved for scope common to several areas.
The matrix defines the approved relationships between disciplines, document types and package types, and the engineering contractor develops and maintains it under the AWP procedure. Discipline leads and document control use it as the governing reference when they assign documents to EWPs, VEWPs and FEWPs. An extract looks like this.
| EWP code | Document type | Discipline |
|---|---|---|
| PIP-GEN | Isometric drawing | Piping |
| STL-GEN | Construction drawing | Structural steel |
| CIV-CON | Foundation design drawing | Civil |
| ELE-GEN | Single line diagram | Electrical |
| INS-HUP | Hook-up diagram | Instrumentation |
| MEC-MEQ | Equipment specification | Mechanical static |
How It Is Used
The register is developed by EWP and VEWP, issued weekly, and synchronized with the document system within days of any change. Discipline leads identify the deliverables and request placeholders, document control creates them, registers them in both systems and allocates each one using the matrix, and the whole list of placeholders for a package exists eight weeks before its planned release. Compliance is monitored through the EWP, VEWP and FEWP 8 week lookahead, and a package approaching release with incomplete allocation is flagged to the contractor's AWP manager and the owner's AWP lead.
The matrix is also the reason the one document, one drawing, one sheet rule can be enforced. A combined dossier has no single document type and no single package, so it cannot be allocated, and a document that cannot be allocated cannot be registered.
Why Allocation Happens at Creation
Allocating after issue is how documents go missing from packages. A drawing issued without a package sits in the document system, counts toward nothing, and surfaces when the construction contractor asks why an IWP is short a detail. Allocation at placeholder creation puts every planned document in a package before any file exists, which is what lets placeholder completeness work as a leading indicator. Writing the matrix and running the allocation rhythm with document control is part of information management. The matrix and the allocated register stay with the owner when the project closes.