Chapter 2 - Systems Flashcards
Define a system
Organised or complex whole; a group of parts interacting in a coordinated way
In terms of systems, why do projects exist?
For the purpose of creating new systems, changing human made systems, or altering natural systems
Name the levels in the assemblage of parts that constitutes a system
- System
- Subsystem
- etc
- Element
What are attributes in a system?
Describe or express the condition of a system, or assemblage parts
What are the function of attributes in human-made systems (or assemblage)?
Attributes are designed into the system to ensure required performance
Integration?
“Designing, implementing, and operating a
system to achieve pre-specified objectives and
requirements through the coordinated
functioning (working I unison, no conflicts) of its elements and subsystems”
Open vs Closed systems?
“Closed: Viewed as selfcontained; focus on the operation, structure, and processes of a system without regard to the environment.
Open: Interacts with and adapts to its environment. Any system that must be adaptable to its environment must be treated as an open system. “
Systems Approach?
“Acknowledges that the behavior of any one element affects the behavior of others and that no single element can perform effectively without help from the others.
- Recognizes interdependencies and cause effect relationships among elements.
- Retains attention on the overall system and the ultimate goal
- Avoids actions that focus exclusively on parts of the system, since such actions are suboptimal for the total system.”
What does systems approach account for?
“1. The objectives
- The environment and constraints .
- The resources .
- The elements of the system.
- The interaction among the elements.
- The management .
- The methodology (models)”
System Model?
“A simplified representation of the
world; it abstracts the essential features of the
system under study.”
Describe system life cycle
“The series of logical, structured steps of the system:
The cycle has the phases of conception, definition, design, development, fabrication, testing, installation or launch, production, operation and maintenance, and enhancement, replacement, or termination.”
Systems Engineering?
“The science of designing complex systems in their totality
to insure that the components and subsystems making
up the system are designed, fitted together, checked,
and operated in the most efficient way.”
Dimensions of systems engineering?
“1. SE is a multi-functional, interdisciplinary,
concurrent effort.
2. It addresses the system’s structure and
elements—its functional and physical
design.
3. It takes into account the entire
system life cycle.
4. A series of steps to
define the subsystems and elements of the
system. The process is an iterative cycle of: top-down anlysis, bottom-up analysis, evaluation”
Systems Development Cycle phases?
“Phase A: Conception - perceived need/problem, feasibility study, proposal, concept
Phase B: Definition - specifiy requirements in detail, define project to deliver requirements
Phase C: Execution - Design, procurement, proeduction, installation
Phase D: Operatio - client control, system developer might remain involved for maintenance/evaluation
“
Phase A: Conception
"– Initiation – RFPs – Feasibility – Needs Analysis – Proposal preparation – Proposal evaluation/project selection – Contracting"