This paper proposes a specification language, hybrid projection temporal lo
gic of modelling, analyzing and verifying biological systems which can be c
onsidered, in general, to be hybrid systems consisting of a non-trivial mix
ture of discrete and continuous components. The syntax and semantics of the
logic are presented, and some examples of hybrid systems are modelled to i
llustrate the formalism. (C) 2000 Elsevier Science Ireland Ltd. All rights
reserved.