Global Oppositions Index
Data-driven analysis of opposition party strength and democratic health across the world.
The Opposition Performance Index (OPI)
The OPI is the first and only global dataset measuring opposition party performance across 105 countries. It aggregates V-Dem indicators through a rigorous analytical framework developed from Gamboa’s strategic theory of opposition — covering four core dimensions: Contestation, Representation, Accountability, and Governance Readiness.
The index gives donors, researchers, and democracy practitioners a rigorous, comparable basis for evaluating opposition strength — and for identifying where targeted support can make the greatest democratic impact.
What the Index Measures
Contestation
How effectively opposition parties contest elections, challenge incumbents, and mobilize voters in competitive environments.
Representation
The degree to which opposition parties authentically represent the interests and diversity of the populations they seek to serve.
Accountability
Capacity to hold governments accountable through legislative oversight, public scrutiny, and institutional engagement.
Governance Readiness
Whether opposition parties have the policy platforms, leadership depth, and organizational capacity to govern if they win power.
Database of Parties
Our growing database profiles opposition parties and their leaders across all regions — tracking election results, legislative representation, ideological positioning, and historical trajectories. It is a living resource for researchers, journalists, and democracy practitioners.