  Four models of energy decoherence are discussed from the common perspective
of intrinsic time-uncertainty. The four authors -- Milburn, Adler, Penrose, and
myself -- have four different approaches. The present work concentrates on
their common divisors at the level of the proposed equations rather than at the
level of the interpretations. General relationships between time-uncertainty
and energy-decoherence are presented in both global and local sense. Global and
local master equations are derived. (The local concept is favored.)
