<![CDATA[This study aimed to develop a HOTS-Lab-based Student Worksheet (LKPD) to improve students' science process skills on the topic of waves on a string. The research employed a Research and Development (R&D) method using the 4D development model, consisting of the Define, Design, Develop, and Disseminate stages. However, the study was limited to the Develop stage. An embedded mixed-method design was applied, in which quantitative data served as the primary data and qualitative data as supporting data. The participants consisted of 32 eleventh-grade students from an Islamic senior high school in Garut Regency. Data were collected through expert validation sheets, pretest-posttest questions, observation sheets, student response questionnaires, teacher practicality questionnaires, and interviews. The results indicated that the developed HOTS-Lab-based LKPD was categorized as valid and practical for use in physics learning. The effectiveness test revealed an improvement in students' science process skills, as indicated by an average N-Gain score of 0.52, which falls into the moderate category. The implementation of the HOTS-Lab-based LKPD assisted by PhET simulations facilitated students in conducting scientific activities such as observing, formulating hypotheses, analyzing data, and communicating experimental results. Therefore, the developed LKPD can be used as an alternative instructional material to enhance science process skills in physics learning.]]>
