How to Select an ELM Software Vendor

An ELM software vendor sells the platform that will run a legal department’s matters, spend, outside counsel relationships, and reporting for years, so the selection carries more weight than most software purchases a department makes. Feature parity across the leading platforms, including Onit, Mitratech, Thomson Reuters, and Wolters Kluwer, is real at a baseline level, and a demo from any of them can look nearly identical to the others. What separates a deployment legal operations trusts from one it quietly works around sits outside the feature list entirely.

What is an ELM software vendor?

An ELM software vendor is the company that builds and licenses the platform a legal department runs its matters, spend, outside counsel management, and reporting through. For context, billing data from about 400 law firms shows invoice rejection rates climbed from 11 to 18 percent in 2025. The category includes Onit, Mitratech, Thomson Reuters Legal Tracker, Wolters Kluwer, and LexisNexis, each covering the enterprise and mid-market segments differently.

Choosing among them is less a software decision than an operating-model decision, since the platform becomes the system a legal department’s daily work runs through. Selecting the vendor is one part of that decision. Selecting the implementation partner who builds and configures the platform is the other, and the two choices carry comparable weight.

Why does a feature checklist fail to predict ELM vendor success?

A feature checklist fails because the leading platforms cover the same baseline functions, so a side-by-side comparison of matter management, eBilling, and reporting checkboxes returns a near tie. Delivery experience across the major ELM platforms shows feature parity holding steady across vendors while implementation complexity, data migration risk, and partner quality decide the actual outcome. The differences that determine results sit beneath the feature list.

• Implementation complexity. The same feature configured two different ways produces two different user experiences, and complexity varies significantly by vendor and by implementation partner.
• Data migration risk. Every vendor can import data in a sales demo. Very few can demonstrate migrating years of inconsistent legacy records at scale.
• Workflow configurability in practice. A platform that looks flexible in a demo environment can require developer resources to extend once real workflows get built.
• Vendor roadmap credibility and partner ecosystem quality. A platform under active investment, backed by a deep bench of certified practitioners, behaves differently three years into a contract than one coasting on a thin partner network.

A vendor selection built entirely around checkboxes routinely produces a platform that technically does everything asked of it and gets used by almost nobody.

How should data migration capability factor into vendor selection?

Data migration capability should factor in as a proof requirement. Vendor and partner claims about migration need evidence, because migrating years of legacy matter, billing, and vendor data is where ELM implementations most commonly run into trouble. Every vendor demo runs on clean sample data. Production data rarely looks like that.

• Ask for evidence at scale. A vendor or implementation partner that can point to a migration involving years of inconsistent records has a different risk profile than one that has only handled clean, recent data.
• Confirm the cleansing approach. Data gets assessed, cleansed, and validated before it loads, and a vague answer here signals a gap that surfaces after go-live.
• Treat migrated data as a distinct workstream. Basla’s own guidance on what gets skipped when legacy migration timelines get compressed covers the specific failure pattern this produces.

How should implementation support factor into vendor selection?

Implementation support should factor in as heavily as the platform itself, because the implementation partner translates the legal department’s operating model into a working system, and a strong platform paired with a weak partner produces a materially worse outcome than the platform’s features would predict. Ownership matters here too. Thomson Reuters’ 2025 Legal Department Operations Index found that departments with dedicated legal operations professionals reach technology adoption rates of 83 percent, compared to 47 percent in departments where general counsel manage the function directly.

• Certification depth. How many practitioners hold platform certification independently. A firm’s overall claim to certification says little about how deep that bench actually runs.
• Change management built in. Change management planned as a core workstream from the start. A single training session scheduled near go-live signals this workstream was never properly planned.
• Cross-platform experience. A partner who has delivered across multiple ELM platforms brings genuine comparative judgment to configuration decisions. A partner who has only ever worked one platform cannot.
• Regional delivery capability. Coverage confirmed against every geography the legal function actually operates in, verified before signing.

Basla’s own breakdown of what an Onit ELM implementation actually involves walks through what this looks like on one specific platform.

How does configurability differ between ELM software vendors?

Configurability differs most in whether workflow changes require a developer or can be handled by an in-house administrator, and that distinction rarely shows up clearly in a sales demo. Some platforms ship a dedicated low-code automation layer. Others rely on fixed configurations that need development resource to extend.

• Matter type and field configurability. How easily new matter types and custom fields get added once the department’s real taxonomy is in place. The demo taxonomy answers a different question entirely.
• Workflow automation depth. Whether approval routing and escalations can be reconfigured in-house as the department’s process matures.
• Reporting customization. What reporting ships out of the box against what requires a custom build, since the gap between the two affects total cost long after go-live.

Basla’s guidance on release management on configured legal platforms covers how configuration changes get tested and rolled out safely once a platform is live, which is the part of configurability a pre-purchase demo cannot show.

What should a legal department confirm about integration before choosing a vendor?

A legal department should confirm every system the ELM platform needs to connect to before finalizing vendor selection, because integration requirements affect timeline and cost more than almost any other variable in the project.

• Finance and ERP systems. Budget and invoice data typically need to flow in both directions between the ELM platform and finance.
• Document management and eSignature. Matter documents and executed agreements need a defined, automatic connection point between systems.
• HR and procurement systems. Legal intake often originates from other departments, and those upstream systems need a clear handoff into the ELM platform.

Scoping these connections before the vendor decision keeps the eventual implementation from discovering integration requirements mid-build.

How much does total cost of ownership vary across ELM vendors?

Total cost of ownership varies more than licensing cost alone suggests, because implementation services, data migration, integration development, and change management frequently exceed the software license itself in year one. Licensing is the most visible line item on a vendor proposal and often the least predictive of the total investment. Only a small minority of legal matters sent to outside counsel stay within budget, the kind of spend gap a well-implemented ELM platform is built to close.

The variables that move total cost most consistently are data quality problems discovered once migration scoping actually starts, integration requirements underestimated during evaluation, scope expansion during configuration, and change management work left out of the original project scope entirely.

What questions should legal teams ask an ELM software vendor directly?

Legal teams should ask questions that test claims against evidence, since a sales conversation naturally leads with strengths and leaves gaps for the buyer to discover independently.

• “Can you demonstrate this against our actual workflows and our own data?” A platform that only looks good in a generic demo environment has not been tested against the department’s real complexity.
• “Can we speak with reference customers at a similar scale, in a similar industry?” A reference at a fraction of the department’s size or complexity answers a different question than the one being asked.
• “What does your product roadmap look like, and what has shipped in the last year?” Continued investment predicts whether the platform keeps pace with the department’s needs three years into the contract.
• “Who handles data migration, and can you show a migration involving genuinely unclean legacy data?” This is the question most likely to separate a confident answer from a demonstrated one.

Basla’s own account of matter management implementation beyond the demo covers what a real build reveals that a sales demonstration does not, which is the gap these questions are designed to close.

Conclusion

Selecting an ELM software vendor on feature comparison alone produces a shortlist where every platform looks equally capable, because at a baseline level, they largely are. Data migration capability, implementation partner quality, configurability, and integration scope are what actually separate a deployment that earns adoption from one that becomes an expensive system people route around.

Frequently asked questions

What is an ELM software vendor?

An ELM software vendor is the company that builds and licenses the platform a legal department runs its matters, spend, outside counsel management, and reporting through. The category includes Onit, Mitratech, Thomson Reuters Legal Tracker, Wolters Kluwer, and LexisNexis.

What is the biggest mistake legal teams make when selecting an ELM vendor?

The biggest mistake is evaluating vendors primarily on a feature checklist, since the leading platforms cover the same baseline functions and return a near tie on paper. The variables that actually predict success, including data migration capability, implementation partner quality, and configurability in practice, sit outside a standard feature comparison.

How important is the implementation partner compared to the vendor?

The implementation partner carries comparable weight to the platform itself, because the partner translates the department’s operating model into a working system. A strong platform paired with a weak implementation partner regularly produces a worse outcome than the platform’s feature list would predict.

What should legal teams test before trusting a vendor’s data migration claims?

Legal teams should ask for evidence of a migration involving genuinely unclean, multi-year legacy data. A demo run on clean sample records proves little about how the vendor handles the department’s actual history. The cleansing and validation approach matters as much as the migration tooling itself.

Does licensing cost predict total cost of ownership for ELM software?

Licensing cost is usually the least predictive line item, since implementation services, data migration, integration development, and change management frequently exceed the license cost in year one. Comparing vendors on license price alone compares the smallest part of the eventual bill.

What questions reveal the most about an ELM vendor during evaluation?

Questions that ask for evidence reveal the most, including a demonstration against the department’s actual workflows, reference customers at a similar scale, a clear product roadmap, and a specific account of how genuinely unclean legacy data gets migrated.

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*This article is provided for general information only and does not constitute legal advice. Basla Solutions provides legal technology implementation and support services and does not practice law.*