A set-aside is the reservation of buys for businesses that qualify for certain socio-economic classifications.  For any buy, set-asides are selected by the Buyer. Only Sellers that meet the required socio-economic set aside for the opportunity can view and bid on the buy. For example, a Buyer may only want to receive bids for a buy from women-owned small businesses. In that case, only Sellers with a women-owned small business socio-economic classification indicated on their Unison Marketplace profile would be able to view and bid on that buy.