The Planning Commission, established in 1950, played a pivotal role in shaping India's economic and social development trajectory for over six decades. Although it was replaced by NITI Aayog in 2015, its legacy continues to influence India's development policies in several fundamental ways.

Firstly, the very concept of planned development, introduced by the Planning Commission through its Five-Year Plans, instilled a long-term vision for national progress. While the Five-Year Plans are no longer formulated, NITI Aayog's strategic documents, such as the 'Three-Year Action Agenda' and 'Fifteen-Year Vision Document,' reflect a similar commitment to structured, goal-oriented development. This foundational idea of setting national priorities and allocating resources strategically remains a core tenet of governance.

Secondly, the Planning Commission's emphasis on a mixed economy, with a significant role for the public sector, laid the groundwork for India's industrial and infrastructure development. Even with the shift towards liberalization and privatization, the government continues to play a crucial role in strategic sectors, social welfare, and infrastructure creation, often drawing from the institutional frameworks and policy approaches established during the Planning Commission era. Public sector undertakings, though reformed, are a direct legacy of this approach.

Thirdly, the Commission's focus on social justice, poverty alleviation, and regional balance through various schemes and targeted interventions has left an indelible mark. Policies related to education, health, rural development, and affirmative action, though evolving, often trace their origins or philosophical underpinnings to the Planning Commission's efforts to address inequalities and ensure inclusive growth. The idea of 'inclusive development' championed by NITI Aayog is a continuation of this legacy.

Finally, the Planning Commission fostered a culture of data-driven policy-making and inter-ministerial coordination. While NITI Aayog aims for a more collaborative and 'think-tank' approach, the need for robust data, expert consultation, and integrated policy formulation across different government departments remains paramount, a practice deeply ingrained by its predecessor. Thus, despite its dissolution, the Planning Commission's foundational principles and institutional memory continue to subtly guide India's development discourse and policy architecture.