THE SHORT ANSWER
In a simplified federal path, an agency defines a need, researches ways to meet it, chooses an acquisition approach, announces or solicits an opportunity as required, evaluates responses, awards a contract, and manages performance. The exact route depends on the purchase and applicable rules.
The buyer starts with a mission need
A program team may need software, support, research, or another service to carry out its mission. Acquisition staff and a contracting officer turn that need into a purchase strategy. The Federal Acquisition Regulation's planning provisions address coordination, risks, milestones, and the approach to obtaining the work.
Before deciding exactly what to buy, agencies may research available products and services. FAR Part 10 describes market research as a way to learn what the market can provide and how the need might be met. An early request for information is part of learning, not an award.
A notice is not the whole process
A solicitation describes what the government seeks and how responses will be judged. SAM.gov carries federal procurement notices, including pre-solicitation, solicitation, award, and sole-source notices. Some routes use different procedures or contract vehicles; read the actual notice and governing documents rather than assuming every purchase follows one diagram.
After award, the work has to be delivered and accepted under the contract. The contractor and agency must manage schedule, changes, evidence of performance, and handoff. That operating period is where a good proposal has to become a dependable system.
Two lenses for a technology team
From the agency's side, ask whether the requirement describes a real outcome and can be evaluated. From a provider's side, ask whether you can meet the specific terms and support the result after launch. Both sides need a clear account of what the finished service will do and how its performance will be demonstrated.
Illustrative example: an agency wants staff to search and summarize a large document collection. Market research explores available approaches. A later solicitation may specify security, accessibility, data rights, evaluation criteria, and support requirements. The winning team still has to implement and operate the service.
Original sources
The process explanations above are educational summaries. The linked primary sources govern their own terms and can change; check them for current requirements.