Letter Codes for above Table
| C | Physical disability |
| D | Dyslexia disability |
| E | Employment |
| F | Sources of Charitable Funding |
| G | General disability |
| H | Hardware |
| I | Information |
| K | Keyboards |
| L | Learning disability |
| M | Input devices |
| N | Voice Recognition |
| O | Microphones |
| P | Publishing |
| R | Hearing disability |
| S | Software |
| T | Training |
| V | Visual disability |
| X | Text to Speech |
| Y | Speech Systems |