The present invention provides a method of doing cognitive diagnosis of mental skills, medical and psychiatric diagnosis of diseases and disorders, and in general the diagnosing of latent properties of a set of objects, usually people, for which multiple pieces of binary information about the objects are available, for example testing examinees using rightwrong scored test questions. Along these lines, an administrator of a network constructs false employee profiles on a social network with the intent of intercepting any email to that employee. Each overview bar represents a document.