Advanced COBOL Programming

Enterprise Architecture, z/OS Mastery, and the Art of Billion-Transaction Systems

DataField.Dev COBOL Trilogy --- Book 3

An open-source textbook for the mainframe professionals who keep the world running.

Series:

• Book 1: Learning COBOL Programming --- The Foundation
• Book 2: Intermediate COBOL: Beyond the Basics --- The Craft
• Book 3: Advanced COBOL Programming --- The Architecture (this volume)

License

This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License (CC-BY-SA-4.0).

You are free to:

• Share --- copy and redistribute the material in any medium or format
• Adapt --- remix, transform, and build upon the material for any purpose, including commercial use

Under the following terms:

• Attribution --- You must give appropriate credit, provide a link to the license, and indicate if changes were made.
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No additional restrictions. You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.

First Edition --- 2026

This textbook was generated with AI assistance and reviewed for technical accuracy. All code examples target IBM Enterprise COBOL for z/OS. See the Preface for the complete accuracy and citation methodology.