These tags refer to the same thing: HP Quality Center. They should be merged into one / have the others be synonyms for hp-quality-center aka HPQC, which is the least ambiguous, though not historically accurate (see item #4 below).
- quality-center has 109 questions, created 2 years ago
- hp-quality-center has 60 question, created 2 months ago
- qc has 85 questions, created 2 years ago
- testdirector also exists with just 5 questions - Mercury's Test Director was bought by HP and re-branded to Quality Center. (And to-date, we still see 'TDD' in the APIs.)
HP Application Lifecycle Management (ALM; terrible name) v11, which just happens to be the one to come after Quality Center 10, includes Quality Center as well some other enterprise tools. If
[hpqc] tags get created in the future, those should also point to hp-quality-center - in the context of StackOverflow questions, those would be the same as HPQC.