Many organizations are implementing process improvement models, seeking to increase their organizational maturity for software development. However, implementing traditional maturity models involves a large investment (as regards money, time and resources) which is beyond the reach of vast majority of small organizations. This paper presents the use and adaptation of some ISO models in the creation of an organizational maturity model for the Spanish software industry. This model was used satisfactorily to (i) improve the software processes of several Spanish small firms, and (ii) obtain an organizational maturity certification for software development, granted by the Spanish Association for Standardization and Certification. 
A maturity model for the Spanish software industry based on ISO standards