| Index represents the number of displacement positions of the array. | Subscript is the number of occurrences of the array. |
| Index does not require a separate declaration. INDEX BY is USED to declare index. | Subscript REQUIRES separate declaration with S9(04) COMP in WORKING-STORAGE SECTION. |
| Helps in FASTER access of data in the table. | Is slower in accessing data items. |
| Uses SET STATEMENT to initialize index. | Uses MOVE statement to initialize subscript. |
| Can DECREASE by using SET DOWN BY statement and SET UP BY statement is used to increase index. | ADD statement is used to increase subscript and SUBTRACT is used to decrease it. |
