Cooperatively develop means to work together to create or produce something. There are many synonyms for this phrase, including collaborative development, joint development, teamwork-based development, and shared development. Other phrases that convey a similar meaning include group development, partnership-based development, and cooperative collaboration. These synonyms all emphasize the importance of teamwork and cooperation in the process of developing something. Whether it is a new product, a project, or a plan, these phrases all suggest that the outcome is the result of a collective effort, rather than the work of a single individual.