Three software process methods
At present, there are three main methods of software process: UP (unified process), open process and OOSP (object-oriented software process). Each method has its own unique characteristics and scope of application.
Three categories of software processes
Software processes can be subdivided into three categories: basic processes, supporting processes and organizational processes. The basic process categories include acquisition, supply, development, operation, maintenance and management processes; The support process class covers the processes of document preparation, configuration management, quality assurance, verification, confirmation, joint review, audit and problem solving; Organizational process categories include infrastructure, improvement and training processes.
Reference source
Baidu encyclopedia-software process.