relations between factors must be linear (positive)

relations between factors must be linear (negative)

(a) or (b)

only one factor should change at a time, others remaining constant

iron and steel

food processing

oil and chemical

all of the above.

value analysis

operation research

linear programming

model analysis

ordering procedure

forecasting sales

production planning

despatching and expediting

Dry work Plan

Halsey Premium Plan

Taylor Plan

Rowan Plan.