When the development of the same subjects is studied over a period of time, the study is called a?
جب انہی مضامین کی نشوونما کا ایک مدت کے ساتھ مطالعہ کیا جاتا ہے تو اس مطالعہ کو کہا جاتا ہے؟
Explanation
When the development of the same subjects is studied over a period of time, the study is called a "Longitudinal Study."
