As we can see in Fig. 2 and Fig. 3, guidelines of level 3 can
be reused through different IUs of level 2. This allows us to
share the same solution in several IUs. For example, Fig. 2 and
Fig. 3 share the guidelines Additional Information and Colour
Assignment in different contexts. Both Fig. 2 and Fig. 3 are
accessible through a menu specified with the pattern of level 1
Data-analysis Assistance Unit.