that all of the assessment that teachers gave in a classroom on a daily basis if we could somehow john padget, we would get a richer picture in a big data approach. student learning over time with various software programs coming to play it now that would be possibly getting really broad-based evidence of student learning over time and trajectory of students earning overtime is what we are interested in. so i talk in the book about the value of performance-based assessment and why it's important for students to have an understanding of knowledge and interdisciplinary research projects that allow them to demonstrate skills and these come with technology. it is a way of doing school and testing. they were integrated into the learning process that teachers and performance assessment schools in new york city that has 28 high schools that don't get state exams have much better outcomes in terms of dropout rates and college assistance. the key metric i find convincing as the teacher turnover rates are so much lower because teachers are committed because they are working as true professionals and th