1 Subjects: “...Validation of the Action Research Model...”

2 Subjects: “...Validation...”

3 Subjects: “...in orbit validation...”

4 Subjects: “...validity...”

5 Subjects: “...validation...”

6 Subjects: “...predictive validity...”

7 Subjects: “...validation principles...”

8 Subjects: “...cluster validity indices...”

9 Subjects: “...model validation...”

10 Subjects: “...model validation...”