Development of an observation sheet instrument to measure biology teachers' ability of pedagogical content knowledge (PCK) application

Abstract

This research aims for making observation sheet instrument which is valid and reliable that is used to measure the ability in applying Pedagogical Content Knowledge (PCK) of biology teachers in learning process. This research categorized Design and Development Research (D & DR) by using 6 development steps according to Peffers, et al and Ellis & Levy. Steps in developing PCK observation instrument are: (1) Identify the problem; 2) Describe the objectives; 3) Design and develop the product; 4) product testing; 5) Evaluate the results of testing; and 6) Communicate the testing results. PCK observation instrument was tested on 11 biology teachers on July-August 2018, involving four raters. Face validity of the instrument involved two experts judgement. Empirical validity acquired by calculating Biserial Correlation value. Instrument reliability determined by calculating Intraclass Correlation Coefficient (ICC) value. Empirical Validity based on Biserial Correlation value shows that 18 items categorized as valid with R count > 0.602, while 10 items are not valid with R count < 0.602. Reliability of PCK observation instrument shows 0.951 for the ICC value which means the instrument has a high stability based on the agreement between raters (reliable).