3. A method according to claim 2 , wherein each fact source is further associated with a fact category of a set of fact categories, wherein each entry of the set of entries of the database includes the fact category of the fact source from which the with which the entry is associated was received, wherein each question of the set of questions is associated with a question type of a set of question types, wherein performing the lookup operation on the database in response to the request includes: collecting fact categories of the entries of the set of entries including the identifier associated with the customer, and wherein generating the set of questions from the facts in the common data format further includes: for each question of the set of questions, selecting a question type of the set of question types based on the collected fact categories.
2. A method according to claim 1 , wherein generating the set of questions from the facts in the common data format further includes: receiving a request to authenticate the customer; and performing a lookup operation on the database in response to the request, the lookup operation being configured to locate entries of the set of entries that include the identifier associated with the customer.