Abstract
Because projects have different characteristics such as number of project members, duration and levels of organizational process maturity depending on their sizes, when we implement software process improvement (SPI) activities in organizations with various characteristics, we need to consider specific implementation methods. In this paper, we discuss practical knowledge about SPI activities implementation methods (e.g. choosing target organizations, offering assistance) for various organizations based on our cross-functional support experiences in implementing SPI activities with different project sizes and maturity levels.