الفهرس 
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Abstract
Computers play a vital role in industry and government due to the
efficiency and productivity that can be increased using the computer
systems. All systems consist of hardware and software. Many
applications (e.g., life support systems, mission-critical systems, nuclear
power plants etc.) require correct and reliable software and hardware for
their perfect operations. So that, it is necessary to have precise,
predictable, and repeatable control over the quality of software
development process and product especially the critical software system.
from research conducted there are a lot of models available to catch the
product quality, the main models that are used periodically in business are
“McCall, Boehm, Dromy, FURPS, ISO”. In this research a complete
study is conducted to four models to show their powerful and weakness
especially at the criticality of the software. Software is deemed safety-critical when its fails or malfunctions results could be damage to the
environment, loss of vital equipment, injury or death.
Within an application some parts may be more critical than others. More
critical components need stronger justification and focus on its quality
also it is realized that criticality of systems are located in the functional of
system and maintainability of the system.
It is important to find a way to analyse the criticality of any software
product. So that the critical analysis procedures are analysed to decide the
important and common used processes used in critical analysis. from the
analysis Commercial off –the-shelf process is one of powerful procedure
that used in critical analysis of software.