Single-Stage Two-Envelope Bidding

In single-stage two-envelope bidding, a bidder submits two sealed envelopes at the same time: one containing the technical proposal, the other the financial proposal (price). Both are opened on the same day, but the financial envelope of a bidder is opened only if their technical envelope has already passed the technical evaluation criteria.

This procedure is used under PPRA Rule 36 for works/services where technical merit needs to be assessed independently of price, without the multi-stage delay of a full EOI-then-RFP process. It differs from single-stage one-envelope bidding, where technical and financial information are submitted together and evaluated at once — typically used for simpler, standardized goods and works.