alt Hacker NewsDon't know about efficient, but there is at least two ways which seem to work OK-ish (although not all that efficient, I gahter):
* Do regular certifications. Before certification, check if the document is up to date. If not, update it.
* Share the documents to answer teammates' questions. Like with a WIKI it may turn out that the important stuff is actually missing/undocumented/outdated. This is then a good opportunity to fix the document.
I used to work in medical devices where it's all about documentation and even there nobody took the time or had time allocated by management to work on documentation. And most people aren't good at writing so the documents were terrible.