There are few things more frustrating then starting a new job with no one to train you, and little to no training materials. Or training materials that are spread across ten different department web pages, emails, handouts, etc.
I believe in creating a comprehensive manual for positions. Even if the individual duties of those positions will vary across sites/departments, there is a fundamental building block for new employees to build upon, or for sites/departments to customize.
In my experience, few positions have these manuals because they take time, and after someone learns their job, they rarely have time to go back and document everything they learned. If done right, the wheel shouldn’t have to be re-created by every new office manager or secretary: invest in it once, and make it worth it by creating a document that will stand the test of time and turnover.