The following were the research instruments used in the study:
Questionnaire for school administrators. This questionnaire for the administrators was called LPI-Self. It was the administrators’ self assessment assessing their practice leadership in various aspects. There were 2 parts: Part
1; The Questionnaire asking the school administrator’s background. Part 2; The Questionnaire asking practice leadership of school administrator. It had a 10-level Rating Scale with a total of 30 items.
Questionnaire for Teachers. A questionnaire for teachers or co-workers called LPI-Observer for assigning practice leadership of their school administrator. It had a 10-leve Rating Scale with a total of 30 items.
Quality of instrument. The internal reliability values for 5 sub-scales of LPI-Self were from .70 to .85, and LPI-Observer from .81 to .92. For a test-retest reliability, 5 kinds of practice were higher than .93. Five factors were analyzed by rotating axis and finding variance value 60.2%.