In British Sign Language, like other languages, signs can vary depending on where you live.
Colours, numbers and phrases such as "good morning" are different from area-to-area.
Extra time to work out how dialects are reflected in Wales’ new GCSE is one reason the qualification will be delayed by a year.
It was due to be introduced in September 2026, but it will now start being taught from 2027.
One expert said a pause was “good” to make sure the GCSE was high-quality.
Sarah Lawrence, a British Sign Language (BSL) teacher and campaigner said: "It's a wonderful opportunity but it needs to be done right."
She said there was a shortage of qualified BSL teachers to teach the GCSE.
"There's two big problems really", she said.
"First of all the qualified teachers out there - but they don't have the BSL skills and then you have people with high-level BSL but they don't necessarily have a teaching qualification."
She said some in the deaf community believed only deaf people should teach BSL.
But Sarah does not agree, saying "how are we going to have enough deaf people to teach it?"
