What are the differences between Sign Language of the Netherlands and Sign-supported Dutch?

"The best response is when people ask: could we join you for one of those sign language classes?"

"I think bilingualism is very important for your self-confidence."

"They have hearing friends now, down the street."

"Would he ever be able to hear music, or the rain beating against the window? That was quite important to me."

Is deaf culture disappearing now that teaching methods are changing?

"Guus' first sign was MOMMY!"

"It definitely isn't a breeze at the regular school, it requires a lot of attention."

"The deaf school turned out to be great for me, actually."

Did teachers in deaf education master sign language in the past?