There are several measures and methods to basically perform the productivity of
calculation. Marvin E Mundel (1978) methods uses calculation approach index number, which is
amount that shows the difference change of time between basic period and actual period. The
result can be decrease, stabil, or increase.
Sarjono H. (2001). Metode perhitungan Angka Indeks Produktivitas Menggunakan Model Marvin E Mundel. The Winners, 2 (1), 18-24.