The Study on the Reliability of the Grading Key Measuring the Performance of the Block Flute Performance of the Secondary School Students Via Generalizability Theory

Abstract

In this regard, the main purpose of the research is to develop a valid and reliable measurement tool which measures the performance of the block flute performance of the secondary school students, considering the errors from generalizability theory and different sources of variability. It is a descriptive study as it is aimed to measure the performance levels of the students for block flute performance and to determine the reliability of their performance scores obtained from the analytical grading key. The study group consists of 23 students in the 6th grade. The block flute performance of the students wasscored by three music teachers with the analytical grading key prepared by there searchers. Generalizability Theory (GT) which helps determine the reliability by evaluating all error sources at the same time was employed in the analysis of the data collected with the analytical grading key. It was found as a result of analyzes based on GT that the analytical grading key for the block flute performance of secondary school students is reliableandvalid (g: 0.89, phi: 0.79), the ideal scorernumber is 4, and the task steps determined in terms of content validity are able to discover the skill