 One popular way of strengthening the requirements for knowledge is to add a justification requirement. A true belief doesn’t per se qualify as knowledge unless the belief is justified. Justification is widely accepted as one species, or variety, of epistemic achievement. In addition to providing (arguably) an essential condition for knowledge, it seems to be an achievement, or attainment, in its own right, even when it doesn’t bring truth in along with it. For this reason, epistemologists have paid considerable attention to the nature of justification. Of course, most of this attention is concentrated on justification by individual believers. But, as we shall see, it is worth pursuing the possibility that group beliefs can also be evaluated as either justified or unjustified.