In his teaching, he developed a system with this group of prisoners.
He says his way of teaching can help anyone learn how to read and write with about 30 hours of study.
To learn his system, people must first know how to write letters of the alphabet and learn which sounds they represent.
The system divides letters into three groups. The first group of letters can be written between two lines.
The second can be written between two lines but part of the letter is above the top line.
The third group has letters that are partly written below the lower line.
John Mogger taught his students to write simple words from the letters,
In this way, his students learned more than 700 words.
Many of them can now write to family members.
They also can read newspapers and magazines.