Peruvian software industry is mainly composed of micro and small enterprises and presents several problems on quality, schedule and costs. Since 2012 government supports the development of innovative software products using standards in order to improve quality. Quality improvement is affected by several factors, some contributing positively and others, negatively. The objective of this study is to identify which factors have influence on the practices adoption. The research method used is unique case study and a survey to collect complementary data. The studied company presented variations in the assessments results and during interviews, six most influential factors were identified. The company improved their software processes with the use of some practices in a project funded by government and lost some practices after that project. The factors that positively influences were: Experience in information technology and Top management support. The negative factors were: Competitive pressure, Perceived usefulness, Perceived ease of use and User training.