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D. Tang, M. Hecht, "Evaluation of Software Dependability Based on Stability
Test Data", 25th Annual Fault- Tolerant Computing Symposium, Pasadena, CA, June,
1995
This paper discusses a measurement-based approach to dependability evaluation of
fault-tolerant, real-time software systems based on failure data collected from
stability of an air traffic control system under development. Several dependability
analysis techniques are illustrated with the data: parameter estimation, availability
modeling of software from the task level, applications of the estimation and model
evaluation in assessing availabilty, identifying key problem areas, and predicting
required duration for achieving desired levels of availability, and quantification
of relationships between software size, the number of faults, and failure rate for
a software unit. Although most discussion is focused on a typical subsystem, Sector
Suite, the discussed methodology is applicable to other subsystems and the system.
The study demonstrates a promising approach to measuring and assessing software
availability during the development phase, which has been increasingly demanded
by the project management of developing large, critical systems.
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