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176 Model Driven Systems Development with Rational Products
Why we build systems
Building systems is a huge, complex, expensive and risky proposition. But, when
we take a risk, manage it well, and overcome it, the rewards can be great.
There are a broad set of concerns that drive the development of any system. In
the end, we want to improve our situation in the world—we want to transform the
world for the better—however we define better. In essence, we want to gain
something from our investments—we take risks for precisely the same
reason—we hope we will gain something (or perhaps, be able to give something)
from having taken the risk.
We want systems to do something for us, with a return that justifies the risk and
expense we take to build the system. We want the system to perform, within a set
of cost and risk constraints, that is, we want it to provide value that exceeds the
cost and risk of building and maintaining it.
Systems engineering
The job of the systems engineer, and that of systems engineering, is to ensure
that we are successful in this endeavor. Consider the International Council on
Systems Engineering (INCOSE) definition of systems engineering:
What is systems engineering?
Systems engineering is an interdisciplinary approach and means to enable
the realization of successful systems. It focuses on defining customer needs
and required functionality early in the development cycle, documenting
requirements, then proceeding with design synthesis and system validation
while considering the complete problem:
Systems engineering integrates all the disciplines and specialty groups into a
team effort forming a structured development process that proceeds from
concept to production to operation. Systems Engineering considers both the
business and the technical needs of all customers with the goal of providing a
quality product that meets the user needs.
Operations Cost & Schedule
Performance Training & Support
Test Disposal
Manufacturing