PROCEDURE DIVISION

The PROCEDURE DIVISION is where a COBOL program does its work. Everything before it describes data; this is the code.

It is organised into paragraphs, each with a name, containing sentences made of statements. Statements read close to English: move a value into a field, add one to a counter, read the next record, write a line, evaluate a condition, call another program.

Control flow is deliberately plain. PERFORM runs a paragraph and comes back, and is also how loops are written. IF and EVALUATE make decisions. There is a GO TO, and in older code you will meet it, but modern practice avoids it in favour of structured PERFORM logic.

A typical batch program has an unmistakable shape: an opening paragraph that opens files and initialises, a main loop that reads a record and processes it until the file is exhausted, and a closing paragraph that writes totals and closes files. Recognising that shape makes most business COBOL immediately readable, because thousands of programs follow it.