Written by authors who design, program, and manage online systems supported by VSAM data sets, this text is intended to train readers -- particularly, business data processing programmers -- to use VSAM in a practical manner. Covers thoroughly the VSAM key sequenced data set knowledge and techniques needed to operate productively in the business data processing environment. Illustrates tools in documented source code form -- computational CLISTs, programs that read LISTCATs and automatically extract and analyze them, and prime or alternate key value distribution analysis routines (diskette available for uploading to mainframe). Also addresses management of VSAM data sets in the production environment.