Establishing identity is becoming critical in our vastly inter- connected society. Questions such as "Is she really who she claims to be?," "Is this person authorized to use this facility?" are routinely being posed in a variety of scenarios ranging from issuing a driver's licence to gaining entry into a country. Biometric recognition refers to an automatic recognition of individuals based on a feature vector(s) derived from their physiological and/or behavioral characteristic. Biometric recognition systems should provide a reliable personal recognition schemes to either confirm or determine the identity of an individual. Applications of such a system include computer systems security, secure electronic banking, mobile phones, credit cards, secure access to buildings, health and social services. By using biometrics a person could be identified based on "who she/he is" rather than "what she/he has" (card, token, key) or "what she/he knows" (password, PIN). In this paper, a brief overview of biometric systems, both unimodal and multimodal, and their advantages and disadvantages, will be presented. In addition to that, implementation of multimodal biometric system using speech and signature features is introduced. Copyright © 2007 IICAI.