The requirements engineering work focuses on gathering information from
members of a client organization in order to produce a single coherent
statement of the requirements for a software system that the client
desires. The unifying goal of this work consists in developing methods
and environments of tools that help in the production of these
requirements.

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Requirements Elicitation is the process of gathering information about the
system to be built from whatever source it is available, including the
client, the users, watching the organization at work, interviews, video
tapes, organizational policy documents, requests for proposals, etc.

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Requirements Analysis is the process of refining all the elicited
information into specifications by deriving what is possible from the
information and validating with the client and users.