Table 7. The correlation among the three tools.
| Systems | Correlation coefficient (r) | Specification |
|---|---|---|
| Modelio and OntoUml | −0.032 | There is a reverse correlation between Modelio and OntoUml |
| Modelio and Protégé | 0.966 | There is a direct correlation between Modelio and Protégé |
| Protégé and OntoUML | −0.060 | There is a reverse correlation between Protégé and OntoUml editor |