System Testing


Give the four different steps in system testing and explain each step.
Q2. Describe reliability, availability and maintainability?
Q3. Define reliability, availability and maintainability?
Q4. Define Mean Time To Repair (MTTR), Mean Time Between Failures (MTBF) and Mean Time To
Failure(MTTF)? Give the formula showing the relationship among MTTR, MTBF and MTTF.
Q5. Using the measures in Q4, list the equations used to calculate reliability, availability and maintainability.
State any assumptions used.
Q6. The customer performs some tests on a automated banking software package with the aid of a
small subset of users on the customer’s site. In the particular step in system testing, the customer
examines how well the calculations are performed by exploring the speed of the responses to user
commands to request a withdrawal, the accuracy of the result on the balance of the account and
the accessibility of the current balance to the user on the next transaction.
Which possible step could this be in system testing? Give reasons for your answer.
Q7. A naval system was designed, built and tested at the developer’s site, which is configured as a ship
might be. Both the customer, users and the clients performed the tests at the developer’s site. After
this testing, the naval system was delivered to the customer as a fully tested system.
When the system is configured at the customer’s site, additional problems with the present environment
conditions were associated with the failure of the system.
Which testing step would have solved this problem? Give reasons for your answer.