  In order to maintain a system, it is beneficial to know its software
architecture. In the common case that this architecture is unavailable,
architecture recovery provides a way to recover an architectural view of the
system. Many different methods and tools exist to provide such a view. While
there have been taxonomies of different recovery methods and surveys of their
results along with measurements of how these results conform to expert's
opinions on the systems, there has not been a survey that goes beyond an
automatic comparison and instead seeks to answer questions about the viability
of individual methods in given situations, the quality of their results and
whether these results can be used to indicate and measure the quality and
quantity of architectural changes. For our case study, we look at the results
of recoveries of versions of Android and Apache Hadoop obtained by running PKG,
ACDC and ARC.
