Heard Mr. S.S. Dey, learned counsel, appearing on behalf of the petitioner. Also heard Ms. Geeta Deka, learned Addl. Senior Government Advocate, appearing on behalf of State Respondents No. 1 to 4, as well as Mr. P.K. Tiwari, learned counsel, assisted by Mr. S. Mili, learned counsel, appearing on behalf of private Respondent No. 5.

2. By filing this writ petition, the petitioners are challenging the appointment of Respondent No. 5 to various offices who was originally appointed as an Assistant Engineer under the Public Works Department in the State of Arunachal Pradesh on Ad-hoc basis and whose services was regularized in the grade of Assistant Engineer (Civil) in the same Department. The Respondent No. 5, thus, holds a substantive post of Assistant Engineer under the Public Works Department.

3. Vide order dated 26.03.2007, issued by the Secretary, Urban Development & Housing, Government of Arunachal Pradesh, Itanagar, the Respondent No. 5 was appointed on officiating capacity as Deputy Director in the pay scale of Rs. 10,000-15,200/- in the Department of UD & Housing, Amnachal Pradesh. Again vide order dated 07.07.2008, the Respondent No. 5 was appointed as an E