What is the formula for software Reliability MTBF (Mean Time Between Failures) given MTTF (Mean Time To Failure) and MTTR (Mean Time To Repair)?
Option B is correct. Mean Time Between Failures (MTBF) measures operational reliability and equals operational time to failure plus repair time: MTBF = MTTF + MTTR.
What is the formula for software Availability (A) expressed in terms of MTTF and MTTR?
Option A is correct. Availability measures the probability that a system is operational at any given time: Availability = MTTF / (MTTF + MTTR) = MTTF / MTBF.
According to Lehman's Laws of Software Evolution, what happens to system complexity as an evolutionary system undergoes continuous change?
Option A is correct. Lehman's Law of Increasing Complexity states that as an evolving program changes, its structure degrades and complexity increases unless active refactoring is performed.
In Software Configuration Management (SCM), what is a formally reviewed and agreed-upon version of a configuration item that serves as a basis for further development?
Option B is correct. A Baseline is an officially approved configuration baseline that can only be changed through formal change control procedures.
Famous Computer Scientist Edsger Dijkstra famously remarked that software testing can be used to show what?
Option A is correct. Dijkstra stated: 'Program testing can be a very effective way to show the presence of bugs, but it is hopelessly inadequate for showing their absence.'