\section{Introduction}
\label{sec:intro}




% In the following, we first focus on the industrial needs of temporal
% properties that motivate our research. We then describe the
% representation languages to represent time as an intrinsic information
% of the system modelled, and their expressivity.  On a simple study
% case, using constant-delays as the simplest timed interactions between
% elements of a system, we show how temporal properties are verified via
% the Tina model-checked, and how such analysis helps engineering design
% in its early-development phases.  We conclude with a discussion on the
% state of the art, and comment on the future work and extensions of
% this approach.
% in AltaRica modelling language, and how an extended version of it
% allow us to express time intervals, where events occur
% non-deterministically.


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