Journal Volume 14 (Fall 2014) The complete Journal can be found online here. Table of ContentsPage PART I: PRINCIPALS AND MATHEMATICS SPECIALIST PARTNERING TO SUPPORT HIGH QUALITY MATHEMATICS INSTRUCTION PRINCIPALS PARTNERING TO BUILD A VISION FOR SCHOOL MATHEMATICS V. Inge, V. Hodges, and P. Robertson1 LEARNING TOGETHER: USING ACTION RESEARCH TO DESIGN PROFESSIONAL DEVELOPMENT M. Alger and R. White21 PARTNERING WITH PRINCIPALS THROUGH FORMAL AND INFORMAL PROFESSIONAL DEVELOPMENT V. Bohidar27 A COLLABORATIVE APPROACH: TWO PERSPECTIVES B. Chong and M. Farrelly41 PRINCIPAL AND MATHEMATICS COACHES' JOURNEY TO IMPROVE MATHEMATICS LEARNING R. Cox49 THE GREATER SUM OF COLLABORATION: ADDING VALUE TO MATHEMATICS EDUCATION THROUGH TEAMWORK J. Deinhart, T. Hulen, B. Butle, and D. Kerr61 K-5 A TALE OF TWO FIRST-YEAR MATHEMATICS SPECIALISTS d. Floyd, M. Perez, J. Lovin, and J. Cavanaugh69 THE COLLABORATION OF A PRINCIPAL AND A MATHEMATICS SPECIALIST S. Garthwaite and P. Granada81 DEVELOPING A NEW PARTNERSHIP T. Martino and S. Chuang89 CLUSTER-GROUPING, CO-TEACHING, AND PROFESSIONAL LEARNING COMMUNITIES FOUCES ON MATHEMATICS INSTRUCTION LEAD TO IMPROVED ENGAGEMENT AND ACHIEVEMENT IN MATHEMATICS FOR STUDENTS K. Schauffner, L. West, A. Mikinis, R. Ward and A. Foreman95 MATH SPEAK AND STUDENTS' JUSTIFICATIONS PROMOTE DEEPER UNDERSTANDING OF MATHEMATICS CONCEPTS J. Svoboda, C. Glassbrenner, S. Vance and P. Hollins109 COLLABORATIVE PROFESSIONAL DEVELOPMENT: DESIGNING YOUR OWN B. Williams115 PART II: OTHER ARTICLES RECRUITMENT, RETENTION, AND REPLACEMENT OF PARTNER SCHOOL DIVISIONS J. Singleton and D. Blount123