Many positions in public service require that the candidate take an examination. Positions, such as these, are classified as "competitive". In order to be considered for employment in a competitive class position the candidate must rank among the three highest standing candidates taking the exam. A separate examination is held, as needed to fill vacancies, for all titles in the competitive class. All positions are considered to be competitive unless deemed by NYS Civil Service that it is not practical to determine the merit and fitness of applicants by competitive examination.