The pandemic period forces the teaching and learning process to be carried out online. However, most of the teaching materials are still in the form of those used in pre-pandemics and, therefore, are irrelevant to use. Therefore, educators need alternative teaching materials suitable to support online learning in a pandemic. For this reason, this study aims to produce interactive electronic student worksheets for junior high school students based on discovery learning and oriented towards quality critical thinking skills in terms of validity, practicality, and effectiveness. The development model used is ADDIE, which consists of analysis, design, development, implementation, and evaluation stages. There are a number of research and development instruments used. It consists of electronic student worksheets validation by material and media experts, electronic student worksheets by students, pretest questions, and posttest questions. The results showed that the electronic student worksheets developed were declared feasible in terms of their validity, practicality, and effectiveness. The validity of electronic student worksheets is indicated by the average score of 3 material and media expert validators, each of which falls into the valid and very valid categories. The practicality of electronic student worksheets is evidenced by the average score of student assessments which fall into the very practical category. At the same time, its effectiveness is indicated by an increase in students' critical thinking skills after being given treatment using electronic student worksheets.