Our company has recently started using Office 365 and I am helping set up our structure of Sharepoint sites, Subsites and Libraries. The company is multi-national with 1000 employees. Each department will be given a team site, e.g. Engineering, Purchasing, Finance etc. e.g. https://companyname.sharepoint.com/teams/Engineering/
In each team site, some content will be used by that department only and some needs to be shared with other departments, which will obviously need different permissions.
I am not sure whether to group the content into Libraries or Subsites. E.g. the Engineering site might look like this: Site/Library#1: Engineering write permission, other departments read only Site/Library#2: Engineering write permission, Finance write, other departments read only Site/Library#3: Engineering write permission, Purchasing write, other departments read only
The general advice online is that, if you have different permission requirements then Subsites are more appropriate. However, this seems like overkill because (certainly with the first department I am looking at) the content is not that disparate and intuitively one site, with Libraries, seems more appropriate.
Despite the advice online, it looks like I can give Libraries different permissions just like with Subsites.
Thank you for any advice you can offer.