Heard Sri Y.V. Ravi Prasad, learned senior counsel for petitioners and Sri Deepak Bhattacharjee, learned senior counsel for respondent Osmania University.

2. In these three writ petitions, grievance of the petitioners is not considering service rendered by them on ad-hoc basis for the purpose of extending Career Advancement Scheme benefits (for short CAS). Since the issue being similar in all the three writ petitions, they are disposed of by this common order. For the sake of convenience, facts in W.P. No. 22479 of 2007 are taken into consideration.

3. Petitioner obtained M.Sc degree in the year 1989; M.Phil in the year 1991 and P.hd in the year 1994. Petitioner claims that he worked between 1992-1994 as Part-time Lecturer in Department of Statistics in Osmania University. After undergoing process of selection, he was selected by duly constituted selection committee of University College for Women, Koti (for short Women’s college) and was appointed on a consolidated pay as Lecturer in Statistics on 9.8.1995 to ad-hoc post. He continued to work in the said post till he was regularly appointed. In pursuant to recruitment notification issued by the University in the year 2006, th