Customer satisfaction, quality improvement and rework reduction are known to be the most important benefits obtained through deployment of software process maturity models and standards within an organization. Since 2003 BL Inform?tica has been motivated and has established and maintained its software processes based on international standards (like ISO 9001:2000) and maturity models (like MPS.BR and CMMI). In spite of the lack of financial and human resources, the organization achieved satisfactory results. This paper describes BL Infom?tica?s software processes improvement plan, lessons learned, difficulties and benefits that where collected during the execution of the improvement plan. It also presents quantitative results that demonstrate the return on investment during these years.