transfer and they are eligible to be posted as Municipal Commissioner Grade II on transfer based on seniority. According to the petiitoners, the post of Municipal Commissioner, Grade-II is governed by Special Rules for Tamil Nadu Municpial Commissioner Subordinate Service Rules. This Rule was amended by the Government by issuing GO Ms. No.191, Municipal Administration and Water Supply Department dated 11.08.1999 by which the post of Municipal Commissioner Grade-II shall be filled up from among the categories of (i) Direct recruitment through Tamil Nadu Public Service Commission (ii) Municipal Employees coming under Tamil Nadu Municipal General Service (iii) Assistant Section Officers working in the Secretariat (iv) Superintendents of Directorate of Municipal Administration, being ministerial service and (v) Executive Officers of the Town Panchayat which also comes under the Ministerial Service. According to the petiitoners, the ratio in which the 20 vacancies are to be distributed among the feeder categories are (i) five vacancies prescribed for recruitment from open market through the Tamil Nadu Public Service Commission (ii) four vacancies for the Assistant Section Officers working in the Secretariat (iii) three vacancies for the Superintendent working in the office of the Directorate of Municipal Administration (iv) two for the Executive Officers of the Town Panchayat and (v) six vacancies for Municipal Employees. It is the case of the petitioners that a twenty point rotation is prescribed under Rule 2 (c) of the Special Rules for Tamil Nadu Municipal Commissioner Subordinate Service for distribution of the vacancies to the post of Municipal Commisisoner, Grade-II and it is designed in such a manner that the vacancies are distributed evenly with appropriate interval so that none of the employees in the feeder categories have to wait for all the 20 vacancies to arise. Thus, a roaster is kept according to the twenty point rotation and whenever vacancies arises, it is distributed evenly to the next feeder category in the roaster. As per the provisio to Rule 2 of the Special Rules, if for any reason, an officer is not available for conferring the promotion as and when his turn comes, the turn will lapse and the vacancy shall be filled by an incumbent from the other category. In this fashion, till 2014-2015, the roaster has been followed and exhausted to the turn of 207. The next turn is 208 and the vacancy falls to the municipal employees as per the rotation. Therefore, for the year 2015-2016, the number of vacancies estimated in the post of Municipal Commissioner Grade-II is 20 and the roaster begins at 208 and ends at 227.