New Delhi, Sept. 19 -- Doing the same work does not necessarily mean doing work of equal value, and that distinction can make all the difference when it comes to pay, the Supreme Court has ruled. According to the court, an employee cannot claim equal pay merely by showing that another employee performs identical or similar duties. To establish a right to pay parity, the claimant must demonstrate broad parity on factors including the source of recruitment, educational qualifications, experience, the manner in which the appointment was made and the nature of the responsibilities and accountability attached to the job. A bench of justices Dipankar Datta and Sheel Nagu said that the law on "equal pay for equal work" has evolved from the earlier approach under which similarity of work could be enough to seek parity. Today, the doctrine requires courts to examine whether the two groups of employees are equal in all material respects, the bench said. "Equal pay cannot be claimed by merely showing identical work," said the bench, laying down the factors that a claimant-employee must establish for seeking parity. These include parity in the source of recruitment, educational qualifications and experience, appointment through a constitutional process, and the nature of responsibilities and accountability. "Mere functional similarity of work has been held to be no longer enough," the court said in its judgment released on Thursday. The ruling came in a dispute involving higher secondary school teachers (junior) in government-aided schools in Kerala. The teachers had been directly recruited under a 1998 government order and sought the full-time pay scale and allowances being extended to teachers in the same cadre who had entered the higher secondary schools through transfer or promotion. The teachers pointed out that their qualifications, duties and responsibilities were identical to those of the transferees and promotees. The Supreme Court, however, upheld the distinction in pay, finding that the two groups could not claim equivalence in experience. The bench traced the evolution of the law from its earlier judgments, observing that the court had, in the last century, treated equal pay for equal work as an expansive anti-exploitation principle under Articles 14 and 39(d) of the Constitution. The position subsequently developed into a more exacting test based on service rules. Referring to its earlier decisions, the court said equal pay depends not merely on the volume or functional nature of work but also on qualitative differences such as reliability and responsibility, provided the classification was bona fide, reasonable and had a rational nexus with its objective. The court also reiterated that educational qualifications, merit and experience can constitute valid grounds for differentiation in pay. The fact that an employee has not gone through the same recruitment process can, in appropriate cases, itself make a difference. "Equal pay must be for equal work of equal value," noted the bench, stressing that the doctrine has "no mechanical application" in every case. In the Kerala dispute, the court found the greater experience of teachers who had been transferred or promoted from lower schools to be a valid and intelligible differentia having a nexus with the objective of granting them higher pay. The benefit, the court noted, effectively preserved the full-time status and benefits they had enjoyed before their promotion. The bench said the doctrine can certainly be enforced by constitutional courts, but only after considering the host of factors governing parity. The bench went on to dismiss the appeals filed by the directly recruited teachers, affirming the Kerala High Court's 2011 judgment that had denied them parity with the promoted and transferred teachers....