In general, the purpose of this study (1) to examine more deeply about characteristics, types, and models of diagnostic test instruments that can detect difficulties student learning; (2) identify students' current speaking skills; and (3) measure zone of potential development of students' speaking ability. Therefore, this research can be a reference in the development of diagnostic test instrument models especially in speaking skills in English subjects at the junior high school level. Operationally, this study aims to develop a variety of test instrument models diagnostic speaking skills that are tailored to the characteristics of students and characteristics of the region or region. A diagnostic test instrument model that is based on Dynamic Assessment will be developed in this study it was designed to perform its function in identifying problems, actual abilities, and potential students.

DOI: doi.org/10.24071/lltc.2018.13