This volume, the ninth volume in the Handbook of Research in Middle
Level Education, is a compilation of research studies focusing on the
use and implementation of common planning time (CPT) in middle level
schools. All of the studies were part of the Middle Level Education
Research SIG's National Middle Grades Research Project (NMGRP) on Common
Planning Time, which provides additional evidence about teachers'
understandings, experiences, the benefits and barriers about CPT. Since
all researchers participating in the SIG-sponsored project utilized the
same data collection protocols and followed the same protocols, the
overall data collection was systematic and is highly reliable. Five
research questions were generated to guide the development of the data
collection protocols. While the authors were encouraged to use their
data to address these project-level questions, they were not required to
do so. The project consisted of both qualitative and quantitative data
collection. Phase I (qualitative) consisted of observations of CPT
meetings and structured interviews with teachers. Phase II
(quantitative) was comprised of an online teacher survey. Within the
chapters of this volume, a variety of relevant and meaningful research
questions are examined utilizing both qualitative and quantitative
methodologies.