This study aims to develop a high-quality
E-LKPD (Electronic Student Worksheet) supported by features such as Bio News,
Bio Think, Bio Activity, Bio Communication, and Bio Revelation (Reflection and
Evaluation), evaluated based on validity, practicality, and effectiveness in
fostering students' critical thinking skills. The research employs the 4D
development method, which includes define, design, develop, and disseminate
stages. In the define stage, an analysis of initial and final problems,
students' cognitive abilities, human respiratory system concepts, E-LKPD tasks,
and learning objectives was conducted, with data analyzed qualitatively and
descriptively. In the design stage, an initial draft of the PBL-based
(Problem-Based Learning) E-LKPD focusing on the human respiratory system was
created, with data analysis performed descriptively and qualitatively. The
develop stage involved collecting validation data through assessments by
validators using a Likert scale of 1–5 and testing the E-LKPD with students
through response questionnaires. Data were analyzed quantitatively and
descriptively, and pretest and posttest results were examined using paired
t-tests and N-gain tests. In the dissemination stage, the research findings
were published in the scientific journal BioEdu (Biology
Education). The results showed that the validity of the E-LKPD reached 89.62%
(very valid), its practicality based on student responses scored 98.46% (very
practical), and its effectiveness, analyzed through a paired t-test result of
0.000 < 0.005, indicated a highly significant effect before and after the
E-LKPD implementation. Additionally, the N-gain test result of 0.86 (high
category) demonstrated an improvement in students' critical thinking skills. In
conclusion, the E-LKPD developed in this study is of excellent quality in terms
of validity (very valid), practicality (very practical), and effectiveness
(very effective).
Keywords: development research, E-LKPD, problem-based
learning, human respiratory system, critical thinking.