<![CDATA[This study aims to develop and test the feasibility of an audio media-based cognitive aspect assessment instrument for negotiating text material for class X students of SMA Bhayangkari 1 Medan based on research from material expert validators and design experts. The total population of students is 79 students and the sample taken is 25 students, namely class X MIA 1. The source of data in this study is a questionnaire. The data collection techniques used in this study were observation and interviews. This type of research is 4-D research and development by Thiagarajan which consists of four stages, namely define, design, development, and dissemanitoin. The results of this study indicate that the audio media-based cognitive aspect assessment instrument on the negotiating text material for class X SMA students has met the good category. The assessment of the level of validity of the audio media-based cognitive aspect assessment instrument by material experts obtained an overall average of 84% with the criteria "Very satisfactory" and media experts obtained an overall average of 94% with the criteria "Very Satisfactory". Assessment of the effectiveness of the audio-media-based cognitive aspect assessment instrument by the teacher was obtained with an average of 94%, and individual trials obtained a score of 79.66%, small group trials obtained a score of 82%, and limited group trials obtained a score of 83, 8%. So it can be concluded that the audio media-based cognitive aspect assessment instrument in the negotiating text material for class X students of SMA Bhayangkari 1 Medan is valid and feasible to be used as an audio media-based cognitive aspect assessment instrument.]]>
