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Systems Development Process 5a Concept Development Stage (3) (Concept…
Systems Development Process 5a Concept Development Stage (3)
Concept Exploration Phase
Needs Analysis Phase Finalised
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Transition from the Needs Analysis to Concept Exploration
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The concept exploration phase
Primarily concerned with conversion of:
the operationally orientated view of the system derived in the needs analysis phase into
an engineering - orientated view required in the concept definition and subsequent phases of development
This results in:
identified performance requirements down to the sub-system level
this involves interpreting and "not replacing" the operational requirements
Summarily, it provides explanations for the "whys" and "hows" of activities in this phase
Why engineering orientated view?
It provides an explicit and quantifiable basis:
for selecting an acceptable functional and physical system concept, and
then for guiding its evolution into a physical model of the system
Performance requirements should be sufficiently broad... to avoid restricting the range of possible system configurations.
This is achievable by exploring a variety of candidate concepts.
Activities of the Concept Exploration Phase
Operational Requirements Analysis (Required Analysis)
analysing the stated operational requirements in terms of their objectives
restating or amplifying (as required) to provide specificity, independence and consistency among different objectives,
to assure compatibility with other related systems, and
to provide such other information as may be needed for completeness.
Performance Requirements Formulation (Functional Definition)
translating operational requirements into subsystem functions and
formulating the performance parameters required to meet the stated operational requirements
Implementation Concept Exploration (Physical Definition)
developing functional descriptions and identifying the associated system components for the most promising cases, and
defining a necessary and sufficient set of performance characteristics reflecting the functions essential to meeting the systems's operational requirements
exploring a range of feasible implementation technologies and concepts offering a variety of potentially advantageous options
Performance Requirements Validation (Design Validation)
conducting effectiveness analyses to define a set of performance requirements that accommodate the full range of desirable system concepts and
validating the conformity of these requirements with the stated operational objectives and refining the requirements if necessary.
Concept Exploration Phase Finalized
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Concept Definition Phase
This phase is also known as the system architectural phase
Transition from the Concept Exploration to the Concept definition phase
The activities in the concept definition phase include:
Functional Analysis and Formulation (Functional Definition)
functional elements and defining element interactions,
developing functional architectural products, and
allocating subsystem functions to the component level in terms of system
formulating preliminary functional requirements corresponding to the assigned functions.
Performance Requirements Analysis (Requirement Analysis)
objectives and to the entire life cycle scenario, and
refining the requirements as necessary to include unstated constraints and
analyzing the system performance requirements and relating them to operational,
quantifying qualitative requirements where possible
Concept Selection (Physical Definition)
designed to performance requirements;
developing physical architectural products; and
synthesizing alternative technological approaches and component configurations
conducting trade-off studies among performance, risk, cost, and schedule to select the preferred system concept, defined in terms of components and architectures
Concept Validation (Design Validation)
concept meets requirements and is superior to its components and
refining the concept as may be necessary
conducting system analyses and simulations to confirm that the selected
Concept definition phase Finalized
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Functional Block Diagramming Tools
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