  A huge amount of data is everyday managed in large organizations in many
critical business sectors with the support of spreadsheet applications. The
process of elaborating spreadsheet data is often performed in a distributed,
collaborative way, where many actors enter data belonging to their local
business domain to contribute to a global business view. The manual fusion of
such data may lead to errors in copy-paste operations, loss of alignment and
coherency due to multiple spreadsheet copies in circulation, as well as loss of
data due to broken cross-spreadsheet links. In this paper we describe a
methodology, based on a Spreadsheet Composition Platform, which greatly reduces
these risks. The proposed platform seamlessly integrates the distributed
spreadsheet elaboration, supports the commonly known spreadsheet tools for data
processing and helps organizations to adopt a more controlled and secure
environment for data fusion.
