This paper presents the MR-MPS Process Reference Model and the MA-MPS Process Assessment Method. They were created according to the Brazilian reality in the MPS.BR Project, aiming at improving software process mainly in small to medium-size enterprises (SMEs). They are compatible with CMMI
and conformant with ISO/IEC 15504 and ISO/IEC 12207. This paper describes three MPS documents: a general guide, an assessment guide and an acquisition guide. The initial project outcomes are presented. The MPS Model has a great potential to be replicated in other countries with similar characteristics related to the software industry.