However dyslexia isn't the only issue that can have an effect on spelling. It's been a while since it was explained to me, but sometimes people can read and write just fine, but they never mastered grammar for specific issue. It's called something. Basically schools recognize it in kids that have to be pulled out of class for other important issues, like speech pathology, or reading intervention. They can read and write well enough to pass, but sometimes it's not caught that they missed something.