Preface Nowadays doing a Ph. D. is almost compulsory to every teaching faculty. Also it is essential for other all practitioners especially of Medical and Ayurveda faculty. As per Human Resource Development, (HRD) Govt. of India announced a PhD degree will be mandatory for teaching positions (Assistant Prof. & for promotion) in Universities from July, 2021. UGC is making a PhD mandatory for the position of an assistant professor from 2021. It will finally improve the quality of education