Self-Teaching Program for FOCAL

This document provides instructions for a self-teaching program for FOCAL, a programming language used on systems like the PDP-15 and PDP-8. The program is designed to be interactive, allowing users to leave the instructional software to practice FOCAL commands and return to learn more. It includes a comprehensive list of re-entry points for specific topics, ranging from basic commands like GO, TYPE, and WRITE, to advanced features like IF, FOR, and grade averaging programs. It also addresses common mistakes and provides guidance on how to navigate the program and utilize its features effectively.