Several scholars have identified a range number potential factors which may led to an improvement in productivity, They have categorized these factors into 9 groups Arditi and Mochtar 1995; Hanna et al., 2005; Thomas et al., 2002; Thomas et al., 2003; Makulsawaudom and Emsley, 2001, Kazaza and Ulubeylib 2007, Thomas and Horman 2006, Mojahed and Aghazadeh 2007, Rojas and Aramvareekul 2003, Shash and AL-Amir 1997.
Numerosos académicos han identificado una gama de factores potenciales, que pueden llevar a una optimización de la productividad. Ellos han categorizado estos factores en 9 grupos Arditi y Mochtar 1995; Hana et al., 2005; Thomas et. al., 2002; Thomas et. al., 2003; Makulsawaudom y Emley 2001; Kazaza y Ulubeylib 2007; Thomas y Horman 2006; Mojahed y Aghazadeh 2007; Rojas y Aramvareekul 2003; Sash y AL-Amir 1997.