a way of doing something, especially a systematic way; implies an orderly logical arrangement (usually in steps)

http://wordnetweb.princeton.edu/perl/webwn?s=method&sub=Search+WordNet&o2=&o0=1&o8=1&o1=1&o7=&o5=&o9=&o6=&o3=&o4=&h=

a set of methods used in a particular area of study or activity

https://dictionary.cambridge.org/dictionary/english/methodology

Model is a way of reality representation. 

Based on Gestão de Desenvolvimento de Produtos 

"A model is a useful representation of some subject. It is a [...] abstraction of a reality [...] expressed in terms os some formalism [...]" Vernadat (1996 p. 24)