Answered Essay: What are the most important dimensions of system dependability?

10.2 What are the most important dimensions of system dependability?
11.8 Explain why all the versions in a system designed around software diversity may fail in a similar way.
12.1 Identify six consumer products that are likely to be controlled by safety-critical software systems.
13.1 Explain the important difference between application security engineering and infrastructure security engineering.

Expert Answer


Ans 10.2 Dependability is a collection of system properties that allows one to rely on a system functioning as required. There are many dimensions of dependability. But , as you asked the impotant ones, hence they are listed below :-

1. Reliability : It is the probablity that a system will perform its intended functionality under specified design limits, without failure, over a given period time.

2. Avalaibility : It is the probablity that the system is operational at a particular time.

3.Robustness : It is the system’s abilityto respond adequately to unanticipated runtime conditions.

4.Fault-tolerant : It is a system’s ability to respond gracefully to failures at runtime.

5.Survivability : It is a system’s ability to resist, recognize, recover from, and adapt to mission-comprimising threats.

6. Safety: It denotes the ability of a software system to avoid failures that will result in

a) Loss of life

b) Injury

c) Significant Damage to property

d) Destruction of property

Ans 12.1 Safet is the most important issue while talking about a consumer product. Possible domestic appliacnes that may include safety- critical software are :

i) Microwave Oven

ii) Power tools such as a drill or electric saw.

iii) Lawnmower

iv) Central heating furnace

v) Garbage disposal Unit

vi) Vacuum Cleaner

vii) Food processor or blender

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