User Experience Designer Michael Angeles on his experience establishing a wiki for documenting internal projects and processes at Lucent:

Wikis can be both simple and complex. On the surface, the idea of the Wiki is simple and elegant, and conceptually this simplicity makes Wikis a good candidate for modest documentation needs or informal, shared notes capturing. Because they’re hypertext publishing environments, however, they can also become quite sophisticated and complex. This duality is precisely what makes them attractive and compelling tools for documentation.

But when it comes down to it, they’re only effective tools if you invest time and effort in making them work for your particular group of users. I’ve learned from the projects I’ve participated in that the greatest success factors for integrating technology into a business include building an understanding of users and removing the barriers to the use of the technology. The technology itself is really of secondary concern. The solutions that are most successful are often the simplest in execution. Understanding how people work and closely matching the system design is one step towards this type of simplicity.

This is from 2004. Timeless wisdom.