  This report contains instructions to install, uninstall and use GREAT Process
Modeller, a tool that supports Communication Analysis, a communication-oriented
business process modelling method. GREAT allows creating communicative event
diagrams (i.e. business process models), specifying message structures (which
describe the messages associated to each communicative event), and
automatically generating a class diagram (representing the data model of an
information system that would support such organisational communication). This
report briefly describes the methodological background of the tool. This
handbook explains the modelling techniques in detail: Espa\~na, S., A.
Gonz\'alez, \'O. Pastor and M. Ruiz (2012). Communication Analysis modelling
techniques. Technical report ProS-TR-2012-02, PROS Research Centre, Universitat
Polit\`ecnica de Val\`encia, Spain, arXiv:1205.0987.
