  XP is a code oriented, light weight software engineering methodology, suited
merely for small sized teams who develop software that relies on vague or
rapidly changing requirements. Being very code oriented, the discipline of
systems engineering knows it as approach of incremental system change. In this
contribution, we discuss the enhanced version of a concept on how to extend XP
on large scale projects with hundreds of software engineers and programmers,
respectively. A previous version was already presented in [1]. The basic idea
is to apply the "hierarchical approach", a management principle of reorganizing
companies, as well as well known moderation principles to XP project
organization. We show similarities between software engineering methods and
company reorganization processes and discuss how the elements of the
hierarchical approach can improve XP. We provide guidelines on how to scale up
XP to very large projects e.g. those common in telecommunication industry and
IT technology consultancy firms by using moderation techniques.
