The four quadrants together constitute the case a legal function presents to the board. Single-quadrant cases lose to fuller-frame cases at every funding cycle. Percentage ranges below are illustrative — empirical anchoring comes from the Annual Legal AI OS Index from 2028 onward.
Quadrant Q1
~15–30% of total ROAI
Productivity value
Time saved per task, cost per matter, capacity freed for higher-value work.
The quadrant the existing return conversation already covers. AI tools that augment lawyer tasks reduce time per task; the saving compounds across the function's volume. Real and measurable, but the risks of measuring are well-documented: vendor demos overstate, pilot results do not scale, lawyers absorb saved time into existing work. A function that measures rigorously against pre-AI baselines with cohort-controlled methodology produces credible numbers. A function that accepts vendor claims at face value cannot. Typically the smallest of the four quadrants when measured honestly.
Quadrant Q2
~40–60% of total ROAI — typically the largest
Defensibility value
Reduction in regulatory exposure, incident cost, and disclosure preparation.
The avoided cost of governance: a regulator inquiry answered in twenty-four hours with a current Defensibility Posture Statement costs a fraction of the same inquiry assembled retrospectively over six weeks. An incident with decision traceability costs an order of magnitude less than one requiring full reconstruction. An EU AI Act conformity assessment completed in advance is cheaper than one completed under regulator deadline. Defensibility value is the quadrant the Defensibility framework operates against. A function that invests in AI without investing in Defensibility captures the productivity quadrant and forfeits this one.
Quadrant Q3
~15–25% of total ROAI
Institutional value
Standing inside the organisation as a strategic capability partner.
Determines budget over a multi-year horizon. A function that adopts AI thoughtfully — with governance, with measurement, with documented methodology — becomes the function the CFO calls when the organisation acquires a target with AI exposure, the function the CEO calls when a sectoral regulator raises AI guidance. These calls compound into budget, headcount, and influence. The quadrant requires the function to talk publicly about its AI posture through industry forums, advisory engagements, and documented governance.
Quadrant Q4
~10–20% of total ROAI — most steeply rewarded by early action
Category positioning value
Standing relative to peer functions for talent, clients, and influence.
Legal functions compete for talent, for client confidence in firm contexts, and for influence within their organisations and the profession. AI maturity has become a primary axis of that competition. The most variable quadrant: a function ahead of its peer cohort captures most of the available positioning value; a function behind captures very little regardless of absolute investment. The compounding nature of positioning rewards early movement and penalises late movement steeply.