The task of detecting, repulsing and preventing attacks in wireless environments is becoming more and more difficult as a result of several factors including defective design and improper requirements specification of wireless intrusion detection systems. Systems specifications provide the basics and framework to design an effective system, and for wireless intrusion detection systems, this assumes greater importance due to the complexity of wireless environments, and the architectural and functional constraints created by such environments. In the light of this, this paper discusses the architectural and functional issues involved in intrusion systems design for mobile and adhoc networks (wireless environments); and also proposes a new way of making systems requirements specification more effective and responsive to the needs of wireless implementations.