Table 7: QinU evaluation of JIRA, both before (v.1) and after implementing improvements (v.1.1). EI stands for elementary indicator; P/GI stands for partial/global indicator.

Characteristics and attributesJIRA v.1JIRA v.1.1
EIP/G IEIP/G I

1. Actual Usability53.3%67.0%
 1.1. Effectiveness in use73.2%86.7%
  1.1.1. Subtask correctness 86.4%91.9%
  1.1.2. Subtask completeness 87.9%95.5%
  1.1.3. Task successfulness 45.5%72.7%
 1.2. Efficiency in use29.3%42.8%
  1.2.1. Subtask correctness efficiency 37.4%44.3%
  1.2.2. Subtask completeness efficiency 37.5%47.3%
  1.2.3. Task successfulness efficiency 13.1%36.8%
 1.3. Learnability in use57.3%71.6%
  1.3.1. Subtask correctness learnability 78.8%75.1%
  1.3.2. Subtask completeness learnability 26.4%77.3%
  1.3.3. Task successfulness learnability 66.7%62.5%