The first two five-year economic development plans were successful, and the 3rd and 4th five-year plans focused on expanding the heavy and chemical industries, raising the capability for steel production and oil refining.
De første to femårsplaner for økonomisk vækst var en succes, den tredje og fjerde plan fokuserede på tung- og kemisk industri, hvor blandt andet kapaciteten til stål- og olieindustri skulle forøges.