Techniques like IBIS (issue-based information system)
(Christel & Kang, 1992), or JAD (joint application development), are widely used.
The analysis and modeling outcome is the definition of user requirements..The most
62 Vaisman
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popular methods for these tasks are enterprise modeling, data modeling (through
entity-relationship modeling), object-oriented techniques, and structured methodologies
like SADT (structured analysis and design techniques) (Ross & Schoman,
1979). Specification is the process of generating the requirements documentation.
CORE (controlled requirements expression) (Mullery, 1979) can be used in this
step. The purpose of requirements validation is to certify that requirements are an
acceptable description of the system to be implemented. Inputs for the process are
the requirements document, organizational standards, and organizational knowledge.
The output is a list that contains the reported problems and the actions necessary
to cope with them. Requirements reviews and requirements testing are common
techniques used for this activity.
Decision support systems extract information from a database and use it to support
the decision making process. A DSS usually requires processing great volumes of
data for generating valuable information.
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