For most corporate legal departments, document review cost is the largest line item in discovery spending — and the one with the least visibility. The per-document rates charged by staffing vendors and outside-counsel review teams are rarely broken down in invoice detail, and the correlation between review hours billed and matter outcome is almost impossible to measure. That opacity has historically made it easy to accept manual first-pass review as an unavoidable operating cost.
The calculus is shifting. In-house teams at companies managing recurring regulatory inquiries, employment class actions, or multi-district litigation have enough volume to make the economics of TAR adoption legible. The question is not whether to use technology assisted review — most sophisticated corporate legal departments already do, either directly or through their outside counsel — but whether the in-house team is positioned to control the privilege cut and first-pass responsiveness determination before handing off to outside counsel for substantive review.
Where the Cost Actually Sits
The EDRM (Electronic Discovery Reference Model) framework identifies multiple cost stages in the discovery lifecycle: identification, preservation, collection, processing, review, analysis, and production. In practice, review dominates cost in litigation and investigation matters — not because other stages are cheap, but because review is the only stage that scales linearly with document volume when done manually.
The cost structure of manual first-pass review is roughly: contract reviewers bill by the hour (or per-document), reviewing at 50 to 80 documents per hour at the low complexity end. On a matter with 500,000 documents post-deduplication and de-NISTing, a 70-document-per-hour average yields roughly 7,100 review hours before any quality-control rework. Second-pass substantive review adds more hours. Privilege review, if done separately from first-pass responsiveness, adds yet more.
These numbers are directionally real across the industry — the specific figures in any matter depend on document complexity, privilege prevalence, the number of review issues, and the cutoff thresholds the parties have agreed to. What matters strategically is that the cost is largely determined by decisions made before a single reviewer opens a document: how was the custodian list built, how aggressive was the de-duplication, what search terms were applied, and whether TAR was used to rank documents before human review begins.
The In-House Internalization Argument
Outside counsel has strong incentives to manage privilege review themselves — it is a high-value, billable task that requires attorney judgment, and most outside firms are reluctant to hand it off to client teams who may not follow the firm's privilege protocols. The internalization argument is not that in-house counsel can replace outside counsel's privilege judgment; it is that in-house teams can handle a meaningful portion of the first-pass cut before outside counsel engagement reduces the volume of documents outside counsel needs to touch.
Consider a plausible scenario: an in-house team at a Chicago-area manufacturing company receives a government civil investigative demand covering a three-year period across eight custodians. The collected ESI, after processing and de-duplication, totals 320,000 documents. Outside counsel is engaged but is not yet ready to begin substantive privilege review — they're in the middle of another matter. The in-house discovery counsel, using a TAR platform integrated with the company's document management system, can run an initial responsive/non-responsive cut and privilege-flag pass that reduces the active review population for outside counsel from 320,000 documents to, say, 85,000 documents that cleared the responsiveness threshold and were routed for privilege screening.
Outside counsel then reviews the 85,000 documents for privilege, produces the non-privileged responsive set, and prepares the privilege log. The in-house effort didn't replace outside counsel's privilege judgment — it reduced the surface area that outside counsel needed to cover at outside-counsel billing rates. That cost differential is material.
What "Controlling the Privilege Cut" Actually Requires
In-house teams that internalize first-pass review need to be clear about what they can and cannot decide. Responsiveness determinations — whether a document falls within the temporal, subject-matter, and custodian scope of the request — are often within in-house counsel's authority to make. The ESI protocol, once agreed with opposing counsel, provides the factual criteria. TAR can execute that determination algorithmically, with attorney sampling and validation.
Privilege determinations are more complex. The attorney-client privilege and work product doctrine require analysis that goes beyond text-pattern matching: Was this a communication seeking or providing legal advice, or is it a business communication that mentions an attorney in passing? Was the document prepared in anticipation of litigation? In-house counsel can make these calls for documents with clear privilege indicators, but borderline documents should flow to outside counsel for final determination before logging. An in-house TAR process that routes borderline privilege candidates to a hold queue for outside counsel review is doing exactly what the protocol should do — not making the hard call, but making sure it gets made by the right person.
We're not saying in-house teams should be making privilege determinations that require the judgment of outside counsel familiar with the specific litigation. We're saying there is a substantial volume of clearly non-privileged, non-responsive documents in every large matter that do not require outside-counsel billing rates to process — and that TAR-based first-pass review is the mechanism for identifying and extracting that population before outside counsel engagement begins.
The Platform Integration Question
Corporate legal departments running internalized first-pass review need to make a decision about platform: should review happen in the company's existing document management environment (iManage, NetDocuments, or similar), in a purpose-built e-discovery platform (RelativityOne, Everlaw, DISCO), or in a hybrid where collection and processing happen in-house but review occurs in a hosted matter management environment?
The answer depends on matter volume, the frequency of recurring discovery, and IT security requirements around data handling. For companies facing frequent government inquiries or managing a litigation inventory of more than a handful of active matters at any time, a purpose-built review platform is typically the more defensible choice — the audit trails, chain-of-custody documentation, and Bates numbering workflows in dedicated e-discovery platforms are better matched to production requirements than most document management systems.
For lower-frequency matters, a managed review vendor using a hosted platform (hosted Relativity or Everlaw instances) avoids the capital expense of standing up in-house infrastructure while still allowing in-house counsel to participate in the review workflow as a supervising reviewer rather than a passive bystander to outside-counsel billing.
Production Format Economics
One cost area that often goes unexamined: production format decisions. FRCP Rule 34(b)(2) allows a requesting party to specify the form of production. Many producing parties default to TIFF/PDF image production with a DAT/Concordance load file containing metadata fields — the legacy format that developed around Concordance and early Relativity deployments. Native format production of ESI is sometimes more defensible (it preserves native metadata and formatting), cheaper to produce (no TIFF conversion cost), and faster to process on the receiving end.
The format decision should be made in the Rule 26(f) conference, documented in the ESI protocol, and coordinated between in-house counsel and outside counsel before production begins. Producing in TIFF when the parties had agreed on native production — or vice versa — creates a costly re-production problem. In-house teams internalizing more of the discovery workflow need to own this decision proactively rather than inheriting outside counsel's default format preference.
Corporate legal departments interested in understanding how a TAR-based first-pass review workflow can be structured for their specific matter volume and regulatory environment are welcome to request a walkthrough.