The 'triple test' for justifying reservation in public employment, particularly in promotions, was laid down by the Supreme Court in cases like M. Nagaraj v. Union of India. The state is required to provide quantifiable data to satisfy three conditions:
\begin{enumerate}
\item (A) The backwardness of the class seeking reservation.
\item (B) The inadequacy of representation of that class in public services.
\item (C) The maintenance of overall administrative efficiency (as mandated by Article 335).
\end{enumerate}
The "extent of reservation," while a crucial factor governed by the 50% ceiling rule from the Indra Sawhney case, is considered a separate constraint on the reservation policy rather than a part of the core triple test used to justify the need for reservation for a specific class.