  This chapter discusses the intricacies of cybersecurity agents' perception.
It addresses the complexity of perception and illuminates how perception shapes
and influences the decision-making process. It then explores the necessary
considerations when crafting the world representation and discusses the power
and bandwidth constraints of perception and the underlying issues of AICA's
trust in perception. On these foundations, it provides the reader with a guide
to developing perception models for AICA, discussing the trade-offs of each
objective state approximation. The guide is written in the context of the CYST
cybersecurity simulation engine, which aims to closely model cybersecurity
interactions and can be used as a basis for developing AICA. Because CYST is
freely available, the reader is welcome to try implementing and evaluating the
proposed methods for themselves.
