The ISO/IEC 29110 standard is used by some Peruvian companies in order to improve the quality of the software they produce and be more productive. However, there are factors that influence the team during the software process improvement, for which, properly identifying these factors will allow improving the level of adoption in future implementations. The purpose of this study is to analyze the environmental factors that influence the adoption of the ISO/IEC 29110 standard, in its basic profile, in 4 small software development companies, using the multiple case study methodology. Each company worked in its own context and defined its own improvement objectives. From the set of environmental factors analyzed, it was found that 5 of them positively influenced all the companies regardless of the context, 2 of them negatively and 2 of them were related between factors due to the context.