The Preamble's commitment to 'Equality of status and of opportunity' is operationalized through Fundamental Rights that prohibit discrimination and enable affirmative action under Articles 15(4) and ______ to address historical disadvantages.

Answer: 16(4)

Substantive equality framework: (a) Preamble equality: Status (dignity regardless of identity) and opportunity (fair access to education, employment, public life), (b) Fundamental Rights operationalization: (i) Article 14: Equality before law, equal protection of laws, (ii) Article 15: Prohibit discrimination on religion, race, caste, sex, place of birth; enable special provisions for women, children, SC/ST/OBC, (iii) Article 16: Equality of opportunity in public employment; enable reservation for backward classes, (c) Affirmative action rationale: Treating unequals equally perpetuates injustice; reasonable classification permitted to address structural inequalities, (d) Applications: (i) Indra Sawhney (OBC reservation with creamy layer exclusion), (ii) M. Nagaraj (reservation in promotions with quantifiable data), (iii) Davinder Singh (sub-classification within SCs), (e) Proportionality overlay: Ensure affirmative action measures are rational, necessary, balanced; benefits reach neediest without undermining merit/administrative efficiency, (f) Illustrates transformative equality: Preamble values guide State to achieve substantive equality through calibrated affirmative action.