Thomson Reuters

The Total Economic Impact™ of CoCounsel Legal

A Forrester Consulting study of real law firms using generative AI in legal practice today.

Thomson Reuters commissioned Forrester to evaluate CoCounsel Legal using its established Total Economic Impact™ (TEI) methodology. The study quantifies the financial and operational value law firms are realizing from CoCounsel Legal today — across costs, benefits, flexibility, and risk.

Generative AI has moved from pilot to procurement. Buyers no longer need to be convinced AI matters in legal — they need to know whether it pays back, when, and how to defend that case to a CFO or managing partner.

This Forrester Total Economic Impact™ study answers that question with primary research, not vendor projections. Forrester interviewed six law firms in active production use of CoCounsel Legal — small, mid, and enterprise/large — and surveyed 90 legal professionals across the same segments. The findings are aggregated into a composite organization with a full ROI, NPV, and payback model that any law-firm leader can map to their own firm.

Inside the study you'll find:

Quantified benefits across the four TEI categories — costs avoided, productivity gained, flexibility created, and risk reduced.
A composite-organization financial model with ROI %, NPV, and payback period.
Direct quotes and use-case patterns from interviewed firms across SLF, MLF, and GLLF segments.
A defensible economic case you can take into procurement, partnership, and CFO conversations.

If you are evaluating, expanding, or defending a generative-AI investment for your firm, this is the independent benchmark you need. The TEI methodology is the standard senior buyers across industries use to size technology business cases — and this study applies it specifically to legal practice, with real customer data behind every number.

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The Total Economic Impact™ methodology is a Forrester standard for evaluating the financial impact of technology investments. This study was independently conducted by Forrester Consulting on behalf of Thomson Reuters. Customer participants are anonymized; results are based on six in-depth interviews and a 90-respondent survey of legal professionals in North America in 2026.