SDRL (supplier data requirements list)
An SDRL (supplier data requirements list) is the buyer-issued list, attached to a tender or purchase order, of every document and data deliverable a supplier must produce alongside the physical scope, with each line carrying a title, a document-type code, the required format, the review class it needs, and the milestone or date it is due by. It is the contractual master checklist of a supplier's paperwork obligations; the same list is often written as a VDRL or VDR (vendor data requirements list), and the supplier's reply committing to deliver each item is the supplier document list (SDL).
What goes on a supplier data requirements list?
A supplier data requirements list sets out, one row per deliverable, every document and data item a supplier must hand over for the scope being bought, and how each one must be delivered. A typical line carries a unique document number, the document title and type, a document-type or category code, the responsible discipline, the required format and number of copies, the review class it needs (for approval, for review, or for information only), and the submission stage tied to a project milestone: with the bid, on award, before manufacture, at factory acceptance test, on delivery, and in the final data dossier. The deliverables themselves range across general arrangement drawings, single-line diagrams and schematics, datasheets, calculations, inspection and test plans, test and inspection certificates, operation and maintenance manuals, spare parts lists and as-built documentation. On a power, electrical or heavy-industry package the list often runs to dozens of items, and on a large package to hundreds, so it is a scope in its own right.
What is the difference between an SDRL, an SDL, a VDRL and an MDR?
The core difference is that the SDRL is the buyer's requirement while the SDL is the supplier's response. The SDRL (supplier data requirements list), sometimes issued as a VDRL or VDR (vendor data requirements list), is the buyer-issued list of documents a supplier must produce, with the required formats, review classes and due dates. The SDL (supplier document list) is the supplier's reply: their committed register of exactly which documents they will provide and when, prepared to satisfy the SDRL. Two further terms sit alongside them. The master document register (MDR) is the live register that then tracks each required document through its revisions and review status during execution. The manufacturing record book (MRB), also called the data dossier or final documentation, is the compiled book of all the completed and accepted documents handed over at the end. In sequence: the SDRL (or VDRL) names the requirement, the SDL commits to it, the MDR tracks it, and the MRB is the finished evidence.
Where does the SDRL appear in a tender, and what must a bidder do with it?
In a tender, the SDRL usually appears as an attachment to the request, referenced inside the conditions of contract and the scope of work, and it is frequently listed among the returnable schedules a bidder must address. At bid time a bidder has to do four things with it: confirm it can produce every listed deliverable in the required format, to the required review class and timing; price the documentation effort, because preparing, submitting and revising that many documents is real engineering time, not a free add-on; flag any line it cannot meet or takes exception to, as a departure or qualification; and, where asked, return a populated supplier document list committing to submission dates. Treating the SDRL as a formality is how documentation hours go missing from a bid.
Why the SDRL is where bid teams quietly lose scope
The SDRL is where scope quietly leaks, because it is easy to miss and every line still costs money. It is often a spreadsheet or attachment referenced one line deep in the conditions of contract, simple to skim past while the team is focused on the technical scope and the price, yet each row is a contractual deliverable with a cost and a deadline. Teams lose two ways: missing the SDRL altogether, so the documentation hours never reach the price, or accepting review classes and milestone-linked submissions (a for-approval hold point before manufacture, for instance) that constrain the program without anyone costing the rework and resubmission risk. Elora Grid reads the full tender, extracts every SDRL line as its own deliverable, cites each one to its source document and page, and maps it into the compliance matrix and returnables, flagging the review classes and milestone-tied submissions so the documentation obligation is visible and priced before the bid goes out. Judgment stays with your engineers, including the effort estimate and which lines to take exception to.
Common questions
What does SDRL stand for?
SDRL stands for supplier data requirements list. It is the buyer-issued list, attached to a tender or purchase order, of every document and data deliverable a supplier must produce alongside the physical goods or works. The same list is often called a vendor data requirements list (VDRL or VDR). It is widely used in EPC, power, energy and heavy-industry procurement to control supplier documentation.
What is the difference between an SDRL and an SDL?
An SDRL is the buyer's requirement: the list of documents a supplier must deliver, with their formats, review classes and due dates. An SDL (supplier document list) is the supplier's response: their committed list of what they will provide and when, prepared to meet the SDRL. In short, the SDRL sets the obligation and the SDL is the supplier's plan to satisfy it.
What documents does an SDRL typically require?
A typical SDRL lists drawings (general arrangements, single-line diagrams, schematics), datasheets, calculations, an inspection and test plan, factory acceptance test and other procedures, test and inspection certificates, operation and maintenance manuals, spare parts lists and as-built documentation. Each line names the format, the review class (for approval, for review, or for information) and the milestone it is due against, from bid through to the final data dossier.
Is the SDRL a returnable schedule?
The SDRL is often issued as part of the returnable schedules, but it is not the same thing. Returnable schedules are the buyer's forms you complete and return with a bid; the SDRL is the buyer's list of documents you must produce, mostly during execution. At bid time you confirm and price the SDRL deliverables; you produce and submit them later, tracked on the master document register.
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