Table 6: Instantiated QinU NFR tree for JIRA case study.

1. Actual usability
 1.1. Effectiveness in use
  1.1.1. Subtask correctness
  1.1.2. Subtask completeness
  1.1.3. Task successfulness
 1.2. Efficiency in use
  1.2.1. Subtask correctness efficiency
  1.2.2. Subtask completeness efficiency
  1.2.3. Task successfulness efficiency
 1.3. Learnability in use
  1.3.1. Subtask correctness learnability
  1.3.2. Subtask completeness learnability
  1.3.3. Task successfulness learnability