Harvey Perkins has worked with the Arundel High School staff for the past year. I attribute my ability to increasing teacher leadership and to engaging teachers in my collegial work to Harvey Perkins. We began the school year with Dr. Harvey Perkins facilitating a full day of defining our core values. This work was critical to my development of a professional learning community at Arundel High School. Our staff enjoyed Dr. Harvey Perkins lecture mixed with activities, video and songs. Harvey Perkins had credibility with these veteran teachers and many remarked that it was best in-service they had ever experienced! As a staff, we referred to the core values in everything we did including modeling, teaching, and praising examples of staff and student behavior that exemplified our values. Then, Dr. Harvey Perkins worked with the core content teams with data. He collected more specific data from MSDE than was available to me as the principal of the school. The data was reviewed and drilled down to identifying specific content strands that we taught and learned well and those that still need improvement. These content team leaders shared their experience with their teams and immediately planned for improvement for this year's state test. In fact., two teachers visited a middle school and after observing classes, made the remark that the math department needed Dr. Harvey Perkins to help them drill down their data to revise instruction. Dr. Harvey Perkins again returned in the spring to facilitate a book club. Twenty six teachers joined the book club to read and explore Tomlinson's book, How to Differentiation Instruction in a Mixed Ability Classroom. As a result of this book club, two things have happened. As the only school in Anne Arundel County, we have a mandatory summer reading for all students from functional life skill classes to AP classes. The second is that I will implement a differentiated staff development plan for 05-06.