** Using WeBWorK **

One thing I've come to appreciate is that the term "link" is confusing with all of this, at least in D2L. In D2L, you create "External Learning Tools". You either create them manually, or they are created automatically when using the content item selection tool. They are higher level things than the links that a student actually clicks on in the end.

Once an ELT exists, then you can place links that use that ELT. For example, in Content, in a D2L Assignment, in a navbar, etc. Again you could do this manually (by selecting External Learning Tools and then selecting and ELT that already exists) or if you are using the content item selection tool, then in addition to creating the ELT(s) it will also automatically place links that use those ELTs.

OK, now at the moment the ELT is created (either manually or automatically), it might be a link to a WeBWorK assignment or it might be just a link to the WW course landing page. Let's assume it is to a specific assignment. If the WeBWorK course has grade passback set to "homework", then on top of everything else there will now be a Grade Item in the Grades tool. That Grade Item is specifically associated with the ELT that was created. So it's not possible for one Grade Item to be affected by multiple WeBWorK courses. Each Grade Item in this discussion will be associated with only one assignment from only one WeBWorK course.

So yes, you can have the one D2L course use links to multiple WeBWorK courses, and those WeBWorK courses may or may not have grade passback in effect and there won't be conflicts. Note that at any given time, the content item selection tool can only be used with one WeBWorK course. Since this tool is only used to *create* ELTs (not to actually use them), once ELTs are created you can technically change which WeBWorK course uses this D2L course's ID, and then use the content item selection tool on some other WeBWorK course.

Trying to summarize:  one D2L course associated with multiple WeBWorK courses is workable, but messy. Conversely, one WeBWorK course associated with multiple D2L courses can work fine for SSO, but as discussed earlier this would be problematic for grade passback.