The use of resources is an important theme in Triz. It’s useful to develop a habit (perhaps an obsession) of always looking to use existing and/or available resources to solve a problem rather than introducing anything new.
One definition of a resource that I’m fond of is:
“A resource is anything that is not being used to its full potential”
What’s nice about this is that encourages us to look at what’s around us (or in the systems we develop) and consider what additional useful functions could be provided by the resources be find.
Here’s a nice example I spotted a few years ago at the Hunters boat yard at Ludham on the Norfolk broads: