Before a lawsuit can proceed as a class action in New Jersey, the proposed class must satisfy several certification requirements. One of those requirements is commonality.
Commonality means that the claims of the proposed class members share at least one important question of law or fact that can be resolved through common evidence. It is not enough for many people to have complaints against the same company. Their claims must be connected by a common issue whose answer will meaningfully advance the case for the class as a whole.
A common question usually arises from the same policy, practice, contract, product, representation, or course of conduct.
Examples may include:
The key question is not simply whether class members suffered similar harm. The court asks whether the defendant’s liability can be evaluated through evidence that applies to everyone in the proposed class.
Potentially, yes. Commonality does not require every factual and legal issue to be identical.
Class members may have different damages, transaction dates, employment histories, or individual experiences. Those differences do not necessarily defeat commonality if a central issue can be answered for all members in one proceeding.
For example, customers may have paid different amounts, but they may still share the common question of whether a standard fee was unlawful.
The common issue must be significant. A question that is too general, such as whether the defendant acted improperly, may not be sufficient unless it can be resolved through a specific classwide answer.
A common question must be capable of producing a common answer. Resolving it should determine an issue that is central to the validity of each class member’s claim.
Suppose employees challenge a written policy that automatically deducted time from every shift. The court may be able to determine through company records whether that policy violated the law.
By contrast, commonality may be harder to establish when liability depends on separate conversations, individualized representations, different decision-makers, or unique circumstances for each person.
The plaintiff seeking class certification must provide evidence rather than rely only on allegations in the complaint.
Relevant evidence may include:
The proposed class definition must also be precise enough to identify the people affected by the common conduct.
Commonality is an initial certification requirement. Predominance is a separate and often more demanding question in class actions seeking monetary damages.
Commonality asks whether at least one meaningful common issue exists. Predominance asks whether common issues are more important than the individual questions that would require separate proof.
A proposed class may satisfy commonality but still fail predominance if liability or damages would require highly individualized investigations.
Commonality helps determine whether one representative case can fairly and efficiently resolve issues affecting many people. It prevents unrelated individual disputes from being combined merely because the plaintiffs sued the same defendant.
A New Jersey class action lawyer can evaluate the defendant’s policies, records, communications, and transaction data to determine whether the proposed members share a legally significant issue capable of classwide resolution.
