Is There a Place in Jewish Law for Observing 'Half Shabbat'?

When I was a teen, you were either religious or you weren’t. Today’s rabbis would do well to broaden their view of religious observance, so more people could feel part of the Jewish community.

I am told there is a growing phenomenon called observing “Half Shabbat.” This, apparently, is when a person keeps Shabbat as a whole, but does...