Population statistics
Prevalence data | Demand & exclusion
Communication ability level (in increasing order)
| C1 | Is impossible for people who know him/her well to understand. Finds it impossible to understand people who know him/her well |
| C2 | Is impossible for strangers to understand. Is very difficult for people who know him/her well to understand. Finds it impossible to understand strangers. Finds it very difficult to understand people who know him/her well |
| C3 | Is very difficult for strangers to understand. Is quite difficult for people who know him/her well to understand. Finds it difficult to understand strangers. Finds it quite difficult to understand people who know him/her well |
| C4 | Is quite difficult for strangers to understand. Finds it quite difficult to understand strangers |
| C5 | Other people have some difficulty understanding him/her. Has some difficulty understanding what other people say or what they mean |
| C6 | Full communication ability |
Graph showing the distribution of communication ability, where those with full ability (C6) are not shown
Important note
These communication ability levels and prevalence statistics are taken directly from the 1996/97 Disability Follow-up Survey (Grundy et al. 1999), which was commissioned by the government to plan welfare support. The GB adult population was 45.6 million at the time of the survey. Please see the Framework section for more detail.

