In the group setting - participants may be concerned about issues of trust - or may be unwilling to discuss sensitive or personal topics. - Data collected (what people say) may not be consistent with how people actually behave. - If the group is too homogeneous their responses may not represent the complete set of requirements. - A skilled moderator is needed to manage group interactions and discussions. - It may be difficult to schedule the group for the same date and time. - If the goal of the focus group is to elicit ideas on a new or changing product - a focus group is not an effective way to evaluate usability.