How to Get More From Your Software Expert Witness

A missing source code version or an overlooked project email can change an expert’s analysis. Discovering the gap during a deposition can also force counsel to reassess a case under pressure.

The work that helps prevent those surprises begins well before the expert report. Effective software litigation consulting gives attorneys a clearer understanding of what the evidence supports, where the record is incomplete, and which technical questions deserve further investigation.

Counsel can make that work more useful by engaging experts early, protecting their independence, and discussing relevant evidence candidly.

Why Expert Collaboration Shapes Litigation Strategy

In a software dispute, counsel may need to establish how a system behaved, who contributed particular code, or what caused an implementation to fail. Those questions help determine which records to seek and which assumptions need testing.

An expert’s findings can inform discovery requests, deposition questions, and assessments of case strengths and weaknesses. In intellectual property and software implementation disputes, those findings can help counsel refine a theory, evaluate settlement options, or prepare for testimony.

Engage Early to Shape Discovery

Engage your software expert while there is still time to identify evidence, investigate gaps, and refine the assignment. Where appropriate, that work can begin before litigation to help counsel assess the technical merits of a potential claim or defense.

The records that matter will depend on the dispute. They may include:

• Source code and version history to trace changes to the software and identify recorded contributors.
• Defect reports and change requests to examine reported problems, attempted fixes, and changes in project scope.
• Contracts, technical specifications, and project communications to compare expected deliverables with documented performance.

Version history is the record of changes saved in a source code repository. A current snapshot of the source code may omit earlier functionality or revisions relevant to the dispute.

For example, in GalaxE.Healthcare Solutions v. RxSense, LLC, I analyzed repository metadata to quantify the parties’ software contributions and assess modifications made after project termination. This demonstrates how repository history can provide critical evidence of software development contributions and changes over time. 

Early involvement also gives counsel and the expert time to agree on priorities, deliverables, and an initial budget. A focused first phase can identify the questions worth pursuing before a broader review begins.

Why it matters for counsel: Technical input can help target discovery and reveal evidentiary gaps while there is time to address them.

Preserve Expert Witness Independence

Counsel should explain the issues, applicable legal standards, and questions the expert has been asked to address. However, the expert is ultimately accountable for all technical methods, analysis, and conclusions. Counsel may help organize the report and clarify the issues, but the expert must independently develop and own the opinions and reasoning presented in it.

That distinction matters when findings complicate the client’s position. Ask the expert to explain the evidence, examine alternative explanations, and identify the limits of an opinion. Counsel should challenge the expert’s reasoning and ask difficult questions, but should not pressure the expert to reach conclusions that the evidence and analysis cannot support. A conclusion that changes after rigorous testing may give counsel a more accurate basis for evaluating the case.

In U.S. federal litigation, expert opinions must satisfy the requirements of Federal Rule of Evidence 702, including the requirements that they be based on sufficient facts or data and reflect the application of reliable methods to the facts of the case. Maintaining the expert’s independence helps ensure that the resulting opinions rest on a defensible analytical foundation.

Why it matters for counsel: Independent analysis helps counsel assess vulnerabilities and understand the evidence and methods supporting each opinion.

Address Difficult Evidence Before Testimony

Give the expert timely access to the portions of the record relevant to the assignment, including material that may undermine the client’s position. Counsel should coordinate access under applicable protective orders and discovery rules.

For example, a software implementation dispute may include emails showing that the customer changed requirements or delayed decisions. A source code analysis may identify third-party components that affect a comparison. These facts can change how the expert interprets the record or qualifies an opinion.

Discuss what the evidence establishes, what remains uncertain, and whether additional investigation is needed. Withholding potentially damaging information from an expert can leave the expert vulnerable to unexpected revelations during cross-examination and undermine the credibility of the expert’s opinions. A better approach is to address sensitive or unfavorable evidence candidly with the expert well before testimony. Keep the expert informed as new documents, testimony, and technical materials become available so the analysis can account for developments in the record.

Why it matters for counsel: Addressing contrary evidence early helps counsel assess its effect on the case and prepare the expert to explain it under questioning.

Three Takeaways for Your Next Expert Engagement

• Engage early enough for technical findings to inform discovery and case assessment.
• Preserve the expert’s independence so opinions follow the evidence and reliable methods.
• Share the relevant record, including unfavorable facts, before testimony puts the analysis under pressure.