2. It is systematic:
3. It provides frequent feedback:
Examples for teachers to intensify math and reading instruction: http://iitoolkit.rmcwebapp.com/refineDownload Intensive Interventions for Students Struggling in Reading and Mathematics: A Practice Guide: http://files.eric.ed.gov/fulltext/ED531907.pdf
Hattie, J., & Timperley, H. (2007). The power of feedback. Review of Educational Research, 77, 81–112.
Vaughn, S., Gersten, R., & Chard, D. J. (2000). The underlying message in LD intervention research: Findings from research syntheses. Exceptional Children, 67, 99–114.