The integration of High Order Thinking Skills (HOTS) into contemporary education systems has emerged as a critical determinant of students’ cognitive development and academic performance. This study investigates the effectiveness of a self-instructional manual designed to enhance HOTS and improve students’ assignment achievement. Drawing on the theoretical foundations of cognitive taxonomy and metacognitive learning frameworks, the research develops a structured intervention model that enables students to independently engage in higher-order cognitive processes such as analysis, synthesis, and evaluation. The study adopts an analytical and conceptual methodology supported by existing empirical literature to evaluate how structured self-learning tools influence learning outcomes. Findings indicate that the implementation of a HOTS-based self-instructional manual significantly improves students’ ability to construct complex arguments, apply critical reasoning, and produce high-quality academic assignments. The study further highlights the importance of aligning instructional materials with national education policies emphasizing HOTS development, particularly in the context of Malaysian education frameworks. Limitations related to contextual adaptability and learner variability are also discussed. The research contributes a scalable instructional model that can be applied across diverse educational environments to optimize student learning outcomes and promote independent cognitive engagement.

High Order Thinking Skills (HOTS), self-instructional manual, assignment achievement, cognitive development

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