Library /sys$common/syshlp/dtm$dw_helplib.hlb terms, group  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  A set of tests that are gathered under a single group
  name so that they can be manipulated as a unit.

  Tests of similar functions are generally organized into
  a group.

  Groups simplify the testing procedure by enabling you
  to group tests that test specific functions without
  running unrelated tests.