Papur ymchwilio am sut mae dwyieithrwydd yn gweithio, neu beidio gweithio yn y byd y tu mas i freuddwydion Bwrdd yr Iaith.

In areas where Welsh-speakers are below 75% it is wholly unusual for strangers to address each other in Welsh. English-only speakers also comport themselves differently when the percentage is above 75%, for example, it has often struck me when addressing an English-only person in Welsh in Tregaron (80% Welsh-speaking) that the reply would often be : "Sorry, I don’t understand Welsh …"; whilst in the nearby town of Aberystwyth (40% Welsh-speaking) the reply was invariably "What ?".