  We generalise Yoshino's definition of a degeneration of two Cohen Macaulay
modules to a definition of degeneration between two objects in a triangulated
category. We derive some natural properties for the triangulated category and
the degeneration under which the Yoshino-style degeneration is equivalent to
the degeneration defined by a specific distinguished triangle analogous to
Zwara's characterisation of degeneration in module varieties.
