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Chapter 4. Preliminary System Design. It is also known as advance development It extends the translation of system level requirement into design requirements for the sub system level. The Functional Analysis Process.

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chapter 4 preliminary system design
Chapter 4. Preliminary System Design
  • It is also known as advance development
  • It extends the translation of system level requirement into design requirements for the sub system level
the functional analysis process
The Functional Analysis Process
  • Functional analysis is the iterative process of breaking down requirements from the system level to the sub system
  • FA reflects the “what” that must be accomplished to achieve objective & goal
  • Conversion to “how” is accomplished by evaluating each individual block, defining the necessary “inputs” & expand “outputs”

Identify need & determine

system requirement

Design and Develop




Operate and maintain








System/product ready

supporting resources


System requirement

organizational stru.

Raw material







Computer resources


Maintenance and support


Identification of Resources Requirements

requirement allocation
Requirement Allocation
  • Fig. 4.6 page 81
design requirements
Design Requirements
  • Compatible with the system operational requirements and maintenance
  • Comply with the allocated design criteria
  • Meet all specification requirements
design requirements parameters
Design Requirements(Parameters)
  • Design for functional capability- concerns with chemical,electrical, mechanical design etc
    • capability derives from the characteristic of design that relates to the functional performance of the system (factors-size, shape, volume
  • Design for reliability- objective is maximize operational reliability and minimize the failure
    • reliability (R) is often expressed as probability of success
design requirements parameters1
Design Requirements(Parameters)
  • Design for maintainability
    • characteristic of design & installation that reflect the ease, accuracy and safety
    • it can be measured in terms of maintenance time
    • minimize the logistic support resources
  • Design for usability and safety
    • concerned with the interfaces between human & HW, SW etc
    • consideration must include human sensory, physiological, minimize the number of people and skill requirement, minimize training and maximize productivity
design requirements parameters2
Design Requirements(Parameters)
  • Design for supportability/serviceability
    • ensure that system can ultimately be serviced and support effectively/efficiently through out planned cycle time
    • includes an application of reliability, maintainability and human factor in design
  • Design for producibility and disposability
    • characteristic of design that pertains to the ease and economy of producing system/products
    • using flexible and economical methods
    • utilization of standard parts
    • allows for the disassembly and disposal of elements or components of the system easily/rapidly changes
design requirements parameters3
Design Requirements(Parameters)
  • Design for affordability
    • characteristic of design and installation that impact budget constraints
    • objective is to base design decision on life cycle cost not just system acquisition
    • economic feasibility on the balanced incorporation of reliability, maintainability, human factor, supportability