Lehman's systems provide an example of how an AIS should not be structured. Examiner Anton R. Valukas's report states, "At the time of its bankruptcy filing, Lehman maintained a patchwork of over 2,600 software systems and applications ... Many of Lehman's systems were arcane, outdated or non-standard."
The examiner decided to focus his efforts on the 96 systems that appeared most relevant, and the examination required training, study and trial and error just to learn how to use the systems. (Also check out Case Study: The Collapse of Lehman Brothers, and An Inside Look At Internal Auditors.)