Problems of bad software documentation

Problems to your business (or your clients' businesses) that are caused by low-quality software documentation include:

Processes and procedures are not defined, or are not correct
Only experts can understand your software documentation
New people take a long time to train
You cannot use temporary staff because they take a long time to train
If your expert user ('power user') leaves, your staff may have problems in using advanced features of the software, because their informal expert advisor is not available
Customers have problems in using new software products