AI Powers Successful Review in Daunting Second Request

Two Months to Tackle Three Million Documents

A financial institution with an urgent matter had two months to review 3.6M documents (2.4TB of data).

With that deadline, any time that reviewers spent on irrelevant documents or unnecessary tasks risked missing their deadline. So outside counsel called on Lighthouse to help efficiently review documents.

AI and Experience Prove Up to the Challenge

Using our AI-powered review solution, we devised an approach that coordinated key data reduction tactics, modern AI, and search expertise at different stages of review.

Junk Removal and Deduplication Set the Stage

We started by organizing the dataset with email and chat threading and removing 137K junk documents. Then we shrank the dataset further with our proprietary deduplication tool, which ensures all coding and redactions applied to one document automatically propagate to its duplicates.

AI Model Removes 1.5 Million Nonresponsive Documents  

To build the responsive set, we used our AI algorithm, built with large language models for sophisticated text analysis. We trained the model on a subset of documents then applied it to all 2.2M TAR-eligible documents, including transcripts from chat platforms.  

The model identified 80% of the documents containing responsive information (recall) with 73% accuracy (precision). The final responsive set consisted of 650K family-inclusive documents—18% of the 3.6M starting corpus.

AI Supports Privilege Detection, QC, and Descriptions

Our AI Privilege Review solution supported reviewers in multiple ways.

• First, we used a predictive AI algorithm in conjunction with privilege search terms to identify and prioritize potentially privileged documents for review.  
• During QC, we compared attorney coding decisions with the algorithm’s assessment and forwarded any discrepancies to outside counsel for final privilege calls.  
• For documents coded as privileged, we used a proprietary generative AI model to draft 2.2K unique descriptions and a privilege log legend. After reviewing these, attorneys left nearly 1K descriptions unchanged and performed only light edits on the rest.

Search Experts Surface the 300 Documents Most Important for Case Prep

Alongside the production requirements for the Second Request, Lighthouse also supported the institution’s case strategy efforts. Each tranche of work was completed in 4 days and within an efficient budget requested by counsel, who was blown away by the team’s speed and accuracy. Using advanced search techniques and knowledge of legal linguistics, our experts delivered:

• 130 documents containing key facts and issues from the broader dataset, for early case analysis.  
• 170 documents to prepare an executive for an upcoming deposition.

Beating the Clock Without Sacrificing Cost or Quality

With Lighthouse Review—including the strategic use of state-of-the-art AI analytics—outside counsel completed production and privilege logging ahead of schedule. The financial institution met a tough deadline while controlling costs and achieving extraordinary accuracy at every stage.