The document discusses information, information technology, information models, and strategy. It defines information as a sequence of symbols that can be interpreted as a message and notes it is closely related to concepts like communication, control, knowledge, and meaning. It defines information technology as the use of computers and telecommunications to store, retrieve, transmit, and manipulate data. It also discusses information models as representations of concepts and relationships within a domain. Finally, it discusses strategy as a way of action when resources are not enough to directly achieve a main goal, and tactics as tools to implement strategy and be subordinated to its main goal.