Abstract: CMM (Capability Maturity Model) is becoming a standard for organisations asking for a roadmap to evaluate and improve maturity of their processes in developing software/systems. Implementation of the CMM is also an important current activity in research & development at Iskratel, Ltd. The paper presents our experience with the use of the SE-CMM (Systems Engineering CMM), particularly with the use of SAM (SE-CMM Appraisal Method) as a self-assessment method. We adapted the method to our particular needs to collect more adequate information specifically about the maturity of the processes in telecommunications systems development. The adapted method SEPAM (Systems Engineering Progress Assessment Method) was developed in a joint project with the academic partner, Jozef Stefan Institute.