<![CDATA[The development of Indonesian legal science continues to face the challenge of constructing an epistemological foundation that reconciles legal certainty, social change, national development, public participation, and substantive justice. In this context, Mochtar Kusumaatmadja’s Legal Development Theory remains important because it offers a framework for understanding law not merely as a formal system of rules, but as a means of orderly social transformation. However, the theory has also generated critical debate, particularly regarding its theoretical status, its instrumental character, and its potential to serve as a justification for state-centered development. This article aims to analyze the epistemological foundations of Legal Development Theory and to reassess its position as a conditional epistemological solution for Indonesian legal reform. This research employs a normative legal method, drawing on conceptual, historical, and philosophical approaches. The legal materials are analyzed through conceptual analysis, historical contextualization, critical epistemological interpretation, and comparative theoretical reflection. The findings show that Legal Development Theory is grounded in a pragmatic and contextual epistemology that integrates normative validity, social responsiveness, developmental function, and Indonesian legal values. Nevertheless, this article argues that the theory should not be understood as an unconditional solution. Its relevance depends on whether development-oriented law is controlled by Pancasila, legal certainty, meaningful public participation, substantive justice, constitutional legitimacy, and the plural character of Indonesian society. By placing Legal Development Theory in dialogue with Progressive Law, Bernard Arief Sidharta’s legal thought, and Pancasila-based legal philosophy, this article contributes to Indonesian legal scholarship by reconstructing the theory as a contextual, participatory, and justice-oriented epistemological framework for legal reform.]]>
