In the early days of large scale information systems development many organisations used the Cobol programming language together with indexed sequential files to build systems for customer billing, payroll, stock control and a variety of other business areas.
Katika siku za mwanzo za kiwango kikubwa mifumo ya habari maendeleo mashirika mengi kutumika COBOL lugha ya programu pamoja na indexed files utaratibu wa kudumu wa kujenga mifumo ya bili wateja, mishahara, kudhibiti hisa na aina ya maeneo mengine ya biashara.