The Ninety-First Constitutional Amendment Act, enacted in 2003, was a landmark legislative measure aimed at addressing the growing problem of oversized Councils of Ministers at both the Union and State levels in India. Prior to this amendment, there was no constitutional limit on the number of ministers, leading to several undesirable consequences, particularly in the era of coalition politics.

The Problem Addressed: Before the 91st Amendment, governments, especially coalition ones, often expanded their Council of Ministers excessively to accommodate political allies, reward defectors, or manage internal party dissent. This practice led to:

1. Administrative Inefficiency: Large cabinets often resulted in unwieldy decision-making processes, duplication of work, and a lack of clear departmental responsibilities.
2. Financial Burden: An inflated number of ministers meant increased expenditure on salaries, perks, and administrative support, placing an unnecessary strain on public exchequer.
3. Political Opportunism: The promise of ministerial berths became a tool for political horse-trading and encouraging defections, undermining the stability and integrity of the democratic process.

Key Provisions of the 91st Amendment Act: To 'right-size' the Council of Ministers, the Act introduced specific provisions:

1. Cap on Council Size (Article 75(1A) and 164(1A)): It mandated that the total number of Ministers, including the Prime Minister (at the Union level) or the Chief Minister (at the State level), shall not exceed 15% of the total number of members of the Lok Sabha (for the Union) or the Legislative Assembly (for the State). A proviso was added for smaller states, stipulating that the minimum number of ministers should not be less than twelve.
2. Disqualification for Defection (Article 75(1B) and 164(1B)): It also stipulated that a member of either House of Parliament or a State Legislature disqualified on the ground of defection under the Tenth Schedule shall also be disqualified to be appointed as a Minister.

Success in Right-Sizing: The 91st Amendment Act has largely been successful in achieving its objective of right-sizing the Council of Ministers:

• Curbing Cabinet Bloat: The 15% cap has effectively prevented the arbitrary expansion of cabinets, leading to more compact and manageable executive bodies.
• Promoting Efficiency: Smaller cabinets can potentially lead to more focused discussions, quicker decision-making, and better coordination among ministries.
• Reducing Financial Burden: By limiting the number of ministers, the Act has helped in controlling government expenditure associated with ministerial positions.
• Strengthening Anti-Defection Law: The provision disqualifying defectors from ministerial posts has added teeth to the anti-defection law, discouraging political opportunism and promoting greater political stability.

While the Act has been instrumental in bringing discipline to the size of the executive, its effectiveness also depends on the spirit of political parties and leaders. Nevertheless, it stands as a crucial constitutional reform that has significantly contributed to rationalizing the structure of the executive and fostering better governance in India.