Saya rasa bisa diterjemahkan langsung seperti ini. Meruoakan proses evaluasi bertingkat yang umum: evaluasi ambang, baru kemudian harga.

********************REFERENSI********************
http://www.psc.utah.gov/utilities/electric/08docs/0803595/60...
As will be discussed below, while the Multi-stage evaluation process has been the most common, this process may not be the best for implementing a coal-based RFP.

The Multi-stage process requires all eligible bidders to submit complete proposals. Proposals are then subject to a threshold evaluation. Bids which meet the threshold criteria are subject to a price and non-price evaluation.