An extensive literature has been reviewed in order to extract the most significant productivity improvement factors Arditi and Mochtar 1995, Shash and AL-Amir 1997, Makulsawaudom and Emsley 2001, Thomas et al., 2002, Rojas and Aramvareekul 2003, Hanna et. al., 2005, Thomas and Horman 2006, Mojahed and Aghazadeh 2007, Kazaza and Ulubeylib 2007.
Gran cantidad de literatura fue revisada con el fin de extraer los factores más relevantes de optimización de productividad Arditi y Mochtar 1995, Shash y AL-Amir 1997, Makulsawaudom y Emsley 2001, Thomas et. al., 2002, Rojas y Aramvareekul 2003, Hanna et al., 2005, Thomas y Horman 2006, Mojahed y Aghazadeh 2007, Kazaza y Ulubeylib 2007.