Marginal costing is often confused with differential costing. The word 'DIFFERENTIAL COSTING' means 'a technique used in the preparation of adhoc information where only cost and income differences between alternate courses of action are taken into consideration'. Therefore, while decision making; only an option with overall gain are selected. The term 'differential cost' means the gross increase or decrease in total costs resulting from a difference in production. The differential cost is known as 'incremental cost' while the cost increases and 'decremental cost' while the cost decreases.