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\item functional requirements gathered by the Iris team's lead scientists;  \item functional requirements unknown at development-time;  \item the distributed nature of the Iris development team;  \item the willing willingness  to bring existing tools and services together in a single application. \end{itemize}  The Iris stack offers a non-technical view of the Iris architecture and design. While it shows effectively how we tried to abstract end users and developers from the VO specifications and from the specifics of the Iris internals, it does not express the technical solutions that we employed to achieve such extensible architecture and to meet the aforementioned requirements. More details about the Iris built-in features and how they can be extended will be provided in the following sections.