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Services
Systems Analysis and Design
We provide complete Systems Analysis and Design (SSAD) service to help your company develop the right solution for your information system needs.
... But what is SSAD?
Systems Analysis and Design uses a combination of three techniques:
- Logical Data Modeling -- the process of identifying, modeling and documenting the data requirements of the system being designed. The data is separated
into entities (things about which a business needs to record information) and relationships (the associations between the entities.
- Data Flow Modeling -- the process of identifying, modeling and documenting how data moves around an information system. Data Flow Modeling examines
processes (activities that transform data from one form to another), data stores (the holding areas for data), external entities (what sends data into a
system or receives data from a system, and data flows (routes by which data can flow).
- Entity Behavior Modeling -- the process of identifying, modeling and documenting the events that affect each entity and the sequence in which
these events occur.
Each of these three system models provides a different viewpoint of the same system, and each viewpoint is required to form a
complete model of the system being designed. The three techniques are cross-referenced against each other to ensure the completeness
and accuracy of the whole application.
SSADM application development projects are divided into five modules that are further broken down into a hierarchy of stages, steps and tasks:
- Feasibility Study -- the business area is analyzed to determine whether a system can cost effectively support the business requirements.
- Requirements Analysis -- the requirements of the system to be developed are identified and the current business environment is modeled in
terms of the processes carried out and the data structures involved.
- Requirements Specification -- detailed functional and non-functional requirements are identified and new techniques are introduced to define
the required processing and data structures.
- Logical System Specification -- technical systems options are produced and the logical design of update and enquiry processing and system dialogues.
- Physical Design -- a physical database design and a set of program specifications are created using the logical system specification and
technical system specification.
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