The teachers I spoke to explained that they had been trained to do lesson planning, lectures to large groups of students and classroom management -- none of which they were now doing. They explained that the adjustment was difficult. Training has not been built into the formal teacher training system for programs like this, and few are really thinking about it at the moment. Now, the teacher is still doing teaching or tutoring when pulling students out into small groups for project-based work, but instead of this being determined by a pacing guide, this is now being determined by where the students are in their learning. What was so interesting was that in this model, teachers were able to do the tutoring and value enrichment work that teachers really like to do but don't always get time to do in a classroom. One of the challenges the teachers mentioned was staying on top of scheduling. How do you keep track when you have students at different places in the curriculum? Those were tough decisions for teachers to make and they were, as you say, learning on the job.