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FAA System Safety Handbook, Appendix A: Glossary
December 30, 2000
A -15
CONCEPT or
TERM
DESCRIPTION
Software Computer programs, procedures, rules, and associated documentation and data pertaining to the
operation of a computer system.
Software Code A software program or routine or set of routines, which were specified, developed and tested
for a system configuration.
Structured
Programming
Any software development technique that includes structured design and results in the
development of structured programs.
Subprogram A separately compilable, executable component of a computer programs.
Subroutine A routine that returns control to the program of subprogram that called it.
Subsystem An element of a system that, in itself, may constitute a system.
Syntax The structural or grammatical rules that define how the symbols in a language are to be
combined to form words, phrases, expressions, and other allowable constructs.
System A composite, at any level of complexity, of personnel, procedures, materials, tools, equipment,
facilities, and software. The elements of this composite entity are used together in the intended
operational or support environment to perform a given task or achieve a specific production,
support, requirement; a set of arrangement of components so related or connected as to form a
unity or organic whole.
A composite of people, procedures, materials, tools, equipment, facilities, and software
operating in a specific environment to perform a specific task or achieve a specific purpose,
support, or mission requirement.
Systems
Approach
A step - by - step procedure for solving problems; a decision making process which moves from
the general to the specific; an iterative process.
System Safety The application of engineering and management principles, criteria, and techniques to optimize
safety within the constraints of operational effectiveness, time, and cost throughout all phases
of the system life cycle.
A standardized management and engineering discipline that integrates the consideration of man,
machine, and environment in planning, designing, testing, operating, and maintaining FAA
operations, procedures, and acquisition projects. System safety is applied throughout a
system's entire life cycle to achieve an acceptable level of risk within the constraints of
operational effectiveness, time, and cost.
System Safety
Analysis
The analysis of a complex system by means of methods, techniques, and / or processes, to
comprehensively evaluate safety related risks that are associated with the system under study.
System Safety
Engineer
An engineer qualified by appropriate credentials: training, education, registration, certification,
and / or experience to perform system safety engineering.
One should have an appropriate background and credentials directly related to system safety in
order to practice in the field, i.e., CSP, PE, training, education, and actual experience.
System Safety
Engineering
An engineering discipline requiring specialized professional knowledge and skills in applying
scientific and engineering principles, criteria, and techniques to identify and eliminate, or reduce
safety related risks.
System Safety A formally charted group of persons representing organizations associated with the system
FAA System Safety Handbook, Appendix A: Glossary
December 30, 2000
A -16
CONCEPT or
TERM
DESCRIPTION
Working
Group
under study, organized to assist management in achieving the system safety objectives.
System Safety
Manager
A person responsible for managing the system safety program.
System Safety
Objectives
System safety is achieved through the implementation and careful execution of an SSP. As
stated previously, the ultimate objective of system safety is eliminated or minimize accidents
and their results. The objectives of an SSP are to ensure that:
• Safety, consistent with system purpose and program constraints, is designed into the system in
a timely, cost-effective manner.
• Hazards are identified, evaluated, and eliminated, or the associated risk reduced to a level
acceptable to the managing activity (MA) throughout the entire life cycle of a system.
• Historical safety data, including lessons learned from other systems, are considered and used.
• Minimum risk is sought in accepting and using new designs, materials, and production and
test techniques.
• Actions taken to eliminate hazards or reduce risk to a level acceptable to the MA are
documented.
• Retrofit actions are minimized.
• Changes in design, configuration, or operational requirements are accomplished in a manner
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