The walkthrough model, derived from Hewlett-Packard’s supervisory practice of Management By Wandering Around, has been portrayed as an effective and efficient system to collect data regarding instructional practices and provide feedback.[6] Elliot Eisner suggests that to be effective, leaders must spend one third of their time in classrooms, and when principals spend more time in classrooms, teachers report a positive perception of the principal.[7] For teacher quality to improve, Sergiovanni states that leadership is the key.[8] School improvement relies heavily on the working relationship between instructional leaders and teachers. The success of the organization is sustained when the leaders serve as teachers for others.[9]