Systems Models
Schematic Models
• A schematic model is a 2-D chart that shows system elements and their linkages.
• Different arrows are used to show information flow, material flow, and information feedback.
Flow System Models
• A flow system model shows the orderly flow of the material, energy, and information that hold
the system together.
• Program Evaluation and Review Technique (PERT), for example, is used to abstract a real
world system in model form.
Static System Models
• They represent one pair of relationships such as activity– time or cost–quantity.
• The Gantt chart, for example, gives a static picture of an activitytime relationship.
Dynamic System Models -Business organizations are dynamic systems. A dynamic model
approximates the type of organization or application that analysts deal with.
• It shows an ongoing, constantly changing status of the system.
It consists of –
o Inputs that enter the system
o The processor through which transformation takes place
o The program(s) required for processing
o The output(s) that result from processing.
SDLC: System Development Life Cycle
An effective System Development Life Cycle (SDLC) should result in a high quality
system that meets customer expectations, reaches completion within time and cost evaluations,
and works effectively and efficiently in the current and planned Information Technology
infrastructure.
System Development Life Cycle (SDLC) is a conceptual model which includes policies
and procedures for developing or altering systems throughout their life cycles.
