Many teachers are reluctant to try new things. Sometimes it's a bad case of "I'vealwaysdoneitthisway-itis." Sometimes it's not being comfortable with the new way or not having the time to develop whatever happens to be needed for the lesson and sometimes it's even coming from a good place. What's that good place? Concern - if I try this new way and it doesn't work I'm going to lose some students and never get them back.