\chapter*{Abstract}
\addcontentsline{toc}{chapter}{Abstract}

\noindent Nowadays the Web is a huge collection of information and
its expansion rate is very high. The users need new ways to
exploit all this available information and possibilities. The
problem is that Web information is meaningless for a computer and
so it is very hard to find out what we are looking for.\\
\emph{\textbf{The}} \emph{\textbf{Semantic Web}} is the new
challenge of web using. Its goal is to bring structure and
semantics to the content of Web pages, creating an environment
where software agents, roaming from page to page, can carry out
sophisticated tasks for users.\\In consequence of this new vision
of the Web many research groups began to study related problems.
One of the most important seems to be the \emph{Ontologies
management}. In fact, Ontologies are considered as a key component
to build the Semantic Web.
\\The present work would explain the new scenario of the Semantic Web
by means of the numerous projects involved (mainly W3C). Moreover,
we will present some projects related to the ontology issue and
the efforts to face and solve \emph{the ontologies dynamics
problem}.
\\In this scenario we will present \textbf{SEWASIE} (\textbf{SE}mantic
\textbf{W}ebs and \textbf{A}gent\textbf{S} in \textbf{I}ntegrated
\textbf{E}conomies), a new project funded by the UE and led by the
Modena and Reggio Emilia University. Finally we will explain the
relevance of the \textbf{MOMIS} (\textbf{M}ediator
envir\textbf{O}nment for \textbf{M}ultiple \textbf{I}nformation
\textbf{S}ources) system, an intelligent information integration
system developed at the University of Modena and Reggio Emilia,
and in particular the attempts to solve the problems of managing
dynamic aspects.








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