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؟
Answer: Longitudinal Study
Explanation
When the development of the same subjects is studied over a period of time, the study is called a "Longitudinal Study."