A company is exploring managed detection and response services for the first time. Before writing formal requirements, it wants to collect general information from several providers about their capabilities, service models, and experience. Which document should it issue?

Vendor selection usually progresses from broad discovery to specific commitment. A request for information gathers general market knowledge, including capabilities, service models, typical approaches, experience, and sometimes indicative pricing, from multiple suppliers when the buyer is still learning what is available. The answers help the buyer write realistic requirements and build a shortlist, and nothing in an RFI commits either side. A request for proposal is issued once requirements are defined; it asks vendors to propose a specific solution, approach, schedule, and price against those requirements so that proposals can be compared and a supplier selected. Issuing one before requirements exist produces proposals that cannot be fairly evaluated. A request for quote asks for pricing on a clearly specified product or service, typically when the buyer knows exactly what it wants and price is the main differentiator. A statement of work is a contract document that defines specific deliverables, timelines, and acceptance criteria for agreed work with a selected vendor; it comes after selection rather than during exploration. Exam caveat: the objectives also list expression of interest, which invites vendors to signal willingness to participate before a formal process. Operational check: confirm the RFI asks open questions and states that responses are non-binding, then use the answers to draft RFP requirements and a shortlist.