# openmainframeproject/cobol-programming-course architecture

> Architecture diagram of the GitHub repository openmainframeproject/cobol-programming-course, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-11-09). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/openmainframeproject/cobol-programming-course
- Repository: https://github.com/openmainframeproject/cobol-programming-course

## Overview

This repository is a set of COBOL-on-z/OS training books and labs, not a course-delivery application. The learner’s documented entry point is the interactive environment; the repository supplies four course volumes covering introductory, core, advanced, and testing topics. The tree also identifies COBOL, JCL, data, DB2, debugging, and test materials as distinct learning resources. No source excerpts were provided, so relationships among individual lessons and lab files are not asserted.

Main entry points: [`COBOL Programming Course #1 - Getting Started/COBOL Programming Course #1 - Getting Started.md`](https://github.com/openmainframeproject/cobol-programming-course/blob/master/COBOL%20Programming%20Course%20%231%20-%20Getting%20Started/COBOL%20Programming%20Course%20%231%20-%20Getting%20Started.md) (Getting Started Book), [`COBOL Programming Course #2 - Learning COBOL/COBOL Programming Course #2 - Learning COBOL.md`](https://github.com/openmainframeproject/cobol-programming-course/blob/master/COBOL%20Programming%20Course%20%232%20-%20Learning%20COBOL/COBOL%20Programming%20Course%20%232%20-%20Learning%20COBOL.md) (Learning COBOL Book), [`COBOL Programming Course #3 - Advanced Topics/COBOL Programming Course #3 - Advanced Topics.md`](https://github.com/openmainframeproject/cobol-programming-course/blob/master/COBOL%20Programming%20Course%20%233%20-%20Advanced%20Topics/COBOL%20Programming%20Course%20%233%20-%20Advanced%20Topics.md) (Advanced Topics Book), [`COBOL Programming Course #4 - Testing/COBOL Programming Course #4 - Testing.md`](https://github.com/openmainframeproject/cobol-programming-course/blob/master/COBOL%20Programming%20Course%20%234%20-%20Testing/COBOL%20Programming%20Course%20%234%20-%20Testing.md) (Testing Book)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_getting_started["Getting Started"]
  node_course1_book["Getting Started Book"]
end

subgraph group_learning_cobol["Learning COBOL"]
  node_course2_book["Learning COBOL Book"]
  node_course2_cobol["COBOL Lab Programs"]
  node_course2_jcl["JCL Lab Jobs"]
  node_course2_data["Lab Data"]
end

subgraph group_advanced_topics["Advanced Topics"]
  node_course3_book["Advanced Topics Book"]
  node_course3_db2["DB2 Labs"]
  node_course3_debug["Debugging Challenges"]
end

subgraph group_testing["Testing"]
  node_course4_book["Testing Book"]
  node_course4_labs["Testing Labs"]
end

node_learner(("Learner"))
node_interactive_course["Interactive Environment"]

node_learner -->|"opens course"| node_interactive_course
node_learner -->|"accesses volume"| node_course1_book
node_learner -->|"accesses volume"| node_course2_book
node_learner -->|"accesses volume"| node_course3_book
node_learner -->|"accesses volume"| node_course4_book

click node_course1_book "https://github.com/openmainframeproject/cobol-programming-course/blob/master/COBOL%20Programming%20Course%20%231%20-%20Getting%20Started/COBOL%20Programming%20Course%20%231%20-%20Getting%20Started.md"
click node_course2_book "https://github.com/openmainframeproject/cobol-programming-course/blob/master/COBOL%20Programming%20Course%20%232%20-%20Learning%20COBOL/COBOL%20Programming%20Course%20%232%20-%20Learning%20COBOL.md"
click node_course2_cobol "https://github.com/openmainframeproject/cobol-programming-course/tree/master/COBOL%20Programming%20Course%20%232%20-%20Learning%20COBOL/Labs/cbl"
click node_course2_jcl "https://github.com/openmainframeproject/cobol-programming-course/tree/master/COBOL%20Programming%20Course%20%232%20-%20Learning%20COBOL/Labs/jcl"
click node_course2_data "https://github.com/openmainframeproject/cobol-programming-course/tree/master/COBOL%20Programming%20Course%20%232%20-%20Learning%20COBOL/Labs/data"
click node_course3_book "https://github.com/openmainframeproject/cobol-programming-course/blob/master/COBOL%20Programming%20Course%20%233%20-%20Advanced%20Topics/COBOL%20Programming%20Course%20%233%20-%20Advanced%20Topics.md"
click node_course3_db2 "https://github.com/openmainframeproject/cobol-programming-course/tree/master/COBOL%20Programming%20Course%20%233%20-%20Advanced%20Topics/Labs"
click node_course3_debug "https://github.com/openmainframeproject/cobol-programming-course/tree/master/COBOL%20Programming%20Course%20%233%20-%20Advanced%20Topics/Challenges/Debugging"
click node_course4_book "https://github.com/openmainframeproject/cobol-programming-course/blob/master/COBOL%20Programming%20Course%20%234%20-%20Testing/COBOL%20Programming%20Course%20%234%20-%20Testing.md"
click node_course4_labs "https://github.com/openmainframeproject/cobol-programming-course/tree/master/COBOL%20Programming%20Course%20%234%20-%20Testing/Labs"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_course1_book toneBlue
class node_course2_book,node_course2_cobol,node_course2_jcl,node_course2_data toneAmber
class node_course3_book,node_course3_db2,node_course3_debug toneMint
class node_course4_book,node_course4_labs toneRose
class node_learner,node_interactive_course toneIndigo
```

## Components

### Getting Started

- [Getting Started Book](https://github.com/openmainframeproject/cobol-programming-course/blob/master/COBOL%20Programming%20Course%20%231%20-%20Getting%20Started/COBOL%20Programming%20Course%20%231%20-%20Getting%20Started.md): `COBOL Programming Course #1 - Getting Started/COBOL Programming Course #1 - Getting Started.md`

### Learning COBOL

- [Learning COBOL Book](https://github.com/openmainframeproject/cobol-programming-course/blob/master/COBOL%20Programming%20Course%20%232%20-%20Learning%20COBOL/COBOL%20Programming%20Course%20%232%20-%20Learning%20COBOL.md): `COBOL Programming Course #2 - Learning COBOL/COBOL Programming Course #2 - Learning COBOL.md`
- [COBOL Lab Programs](https://github.com/openmainframeproject/cobol-programming-course/tree/master/COBOL%20Programming%20Course%20%232%20-%20Learning%20COBOL/Labs/cbl): `COBOL Programming Course #2 - Learning COBOL/Labs/cbl`
- [JCL Lab Jobs](https://github.com/openmainframeproject/cobol-programming-course/tree/master/COBOL%20Programming%20Course%20%232%20-%20Learning%20COBOL/Labs/jcl): `COBOL Programming Course #2 - Learning COBOL/Labs/jcl`
- [Lab Data](https://github.com/openmainframeproject/cobol-programming-course/tree/master/COBOL%20Programming%20Course%20%232%20-%20Learning%20COBOL/Labs/data): `COBOL Programming Course #2 - Learning COBOL/Labs/data`

### Advanced Topics

- [Advanced Topics Book](https://github.com/openmainframeproject/cobol-programming-course/blob/master/COBOL%20Programming%20Course%20%233%20-%20Advanced%20Topics/COBOL%20Programming%20Course%20%233%20-%20Advanced%20Topics.md): `COBOL Programming Course #3 - Advanced Topics/COBOL Programming Course #3 - Advanced Topics.md`
- [DB2 Labs](https://github.com/openmainframeproject/cobol-programming-course/tree/master/COBOL%20Programming%20Course%20%233%20-%20Advanced%20Topics/Labs): `COBOL Programming Course #3 - Advanced Topics/Labs`
- [Debugging Challenges](https://github.com/openmainframeproject/cobol-programming-course/tree/master/COBOL%20Programming%20Course%20%233%20-%20Advanced%20Topics/Challenges/Debugging): `COBOL Programming Course #3 - Advanced Topics/Challenges/Debugging`

### Testing

- [Testing Book](https://github.com/openmainframeproject/cobol-programming-course/blob/master/COBOL%20Programming%20Course%20%234%20-%20Testing/COBOL%20Programming%20Course%20%234%20-%20Testing.md): `COBOL Programming Course #4 - Testing/COBOL Programming Course #4 - Testing.md`
- [Testing Labs](https://github.com/openmainframeproject/cobol-programming-course/tree/master/COBOL%20Programming%20Course%20%234%20-%20Testing/Labs): `COBOL Programming Course #4 - Testing/Labs`

### Other components

- **Learner**
- **Interactive Environment**

## Connections

- Learner → Interactive Environment: opens course (evidence: `README.md`)
- Learner → Getting Started Book: accesses volume (evidence: `README.md`)
- Learner → Learning COBOL Book: accesses volume (evidence: `README.md`)
- Learner → Advanced Topics Book: accesses volume (evidence: `README.md`)
- Learner → Testing Book: accesses volume (evidence: `README.md`)