"cpm.4.CSE/IRT" ("c"ompact "p"rocess "m"odel for "C"ompetence "S"cience "E"ducation based on "IRT" models) is a process model for competence measurement based on IRT models. It allows the efficient development of measuring instruments for computer science education. "Cpm.4.CSE/IRT" consists of four sub processes: "B1 determine items," "B2 test items," "B3 analyze items according to Rasch model," and "B4 interpret items by criteria." "Cpm.4.CSE/IRT" is modeled in IDEF0, a process modeling language that is standardized and widely used. It is implemented in R, an open-source software optimized for statistical calculations and graphics that allows users to interact using the web application framework Shiny. Through coordinated processes, "cpm.4.CSE/IRT" ensures the quality and comparability of test instruments in competence measurement. "Cpm.4.CSE/IRT" is demonstrated using an example from the competence area of "Modeling."