Intranet
Jakob Nielsen has published the executive summary of his study of 56 intranets.

The study documents intranet IA processes and the resulting designs, both in terms of the visible user interfaces and the underlying structures. The report contains detailed profiles of 56 real-world intranets’ information architecture as well as generalised analyses and best-practice recommendations derived from these many case studies.

- Read summary- Order study ($396 for a single-user license)