Mohammad Ali Jahantighi - Department of Mathematics, Zahedan Branch Islamic Azad University, Tehran, Iran
Mohsen Vaez-Ghasemi - Department of Mathematics, Science and Research Branch, Islamic Azad University, Tehran, Iran
Zohreh Moghaddas - Department of Mathematics, Science and Research Branch, Islamic Azad University, Tehran, Iran

Different processes in Decision Making Unit (DMU) are the same as sub processes in that DMU when it is not considered as blackbox. Most of the time these sub processes are mooted in a series structure and frequently used in real world applications. When it is aimed to evaluate performance of a unit with its sub processes and what it has done in past, those techniques which show progress and regress can be used. One of these famous techniques are Malmquist Productivity Index (MPI). Here MPI has been developed and used for series structural DMUs, with two components, in which intermediate inputs and outputs exist.

Malmquist Productivity Index; Data Envelopment Analysis; Multi-component model; Progress; Regress