[Ken Case]

Contexts are simply a way of grouping actions that could be done more efficiently if done at the same time. That includes trips to the grocery or hardware store or library, but it also includes ordering stuff from frequented e-commerce sites (so I don't waste time checking in and out), or even just activities that require a particular mental state such as writing email or writing software. It's inefficient for me to shift back and forth between writing email and writing software, so for me it's useful to split those activities into separate contexts even though I do both activities in the same locations using the same tools.

Make sense?