RFP

Bids/Proposal/Contracts/Tender

RFP (Request for Proposal)
Includes each and every detail, 
- Identifying Problems
- Focus on issues,
- Solution, Technical and commercial details
- Financial details, cost and budget with Schedule
- Specification of work
- Qualification of vendors 

understand overall idea of what you want from suppliers.
Who you are, What you do, What you stand for
Scope of the work: Write out what you want, detailed list, expected outcomes
Outcome & performance standards - Basic Minimums, what should be accomplished, How you monitor suppliers
Deliverables: What all do you Expect to receive. An inventory list.
Terms & Conditions : Legal stuff
Payments Incentives and Penalties : How we will pay them, what happens If things go wrong.
Contractual Terms and Conditions 
Requirement for Proposal preparation: What do you want them to give you
Evaluation & Award process: How will win the bid.
Process Schedule: Give Exact Dates of the evaluation Process
Contact: Contact Information so Bidder can get a hold of you.


RFQ (Request for Quotation) - For Specific information
-Prices,
-Quantities,
-Specifications of products and services,
-schedule of services,
-quality level, etc.

To compare the prices of all vendors and then shortlisting some of the them.

RFI (Request for Information)
When we want information about the vendors
- Products / Services
- Capabilities,
- Strategies. etc.

Used for comparing these vendors
This will help the main client / agency to shortlist RFP.