Not only will the students and community volunteers be working to revitalize the area, they will be paying attention to specific aspects from an environmental standpoint, hence the tie-in with Earth Day.
The trend is probably epitomised by the tendency for sponsors to film their tie-in commercials for a movie at the same time and on the same set as the movie itself.
There may be a significant tie-in here between the looming war with Iraq and the threats we're picking up in intelligence intercepts.
For high-profile Hollywood films, a tie-in with The History Channel or Discovery has become almost mandatory.
It has long been noted that rent controls, or price controls generally, induce tie-in sales to avoid the controlled price.
Another issue raised by the independence/dependence distinction is a possible tie-in between the Great Depression and dependent-managed central banks.
This behavior explains how one firm with a head start can use tie-in sales and other behavior to prevent generic complementary products from being developed.
With respect to Lariam, we don't have any evidence that suggests that there is a tie-in between suicides and the use of the medication.
there's a tie-in to another case I'm working on
Oh, and a tie-in book and various bits of merchandise, so there seems to be an audience for it.