What solicitation document is used for complex requirements involving a need to negotiate or hold discussions with potential offerors?

The solicitation document used for complex requirements that involve the need to negotiate or hold discussions with potential offerors is typically a Request for Proposal (RFP). An RFP allows the issuing agency to communicate its needs and requirements while inviting detailed proposals from bidders, facilitating dialogue to refine offers and negotiate terms. This process is distinct from a Request for Quotation (RFQ), which is usually used for simpler acquisitions.