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This study investigates software process engineering boosted with software process modelling and computer based support for it. The research question discussed is how to support process understanding, guidance and process model utilisation with a selected design environment. We study the research question by conducting a process improvement experiment in an industrial software development environment in Nokia. In practice, the experiment reported includes an introduction of Teleconi Design Environment (TDE) and customisation of it for the local needs of NMPJSP at Jyvaskyla site. TDE is a Nokia in-house tool, which provides multi-user modelling capabilities and integrates both process modelling and production support. The TDE customisation discussed in this paper is focused in the development of process templates and associated on-line guidance, The effect of TDE adoption is evaluated against the current process support as well as against the feedback received from software designers participating in customisation. BackgroundThis paper reports a study investigating the customisation of a design environment to support effectively software development at NMP/SP at Jyvaskyla site (later SP Jyvaskyla). The research objective in our study was to examine how to improve support for process understanding, guidance and process model utilisation in projects with the help of the selected design environment.To provide characterisation of the research context, the following paragraphs give an overview of the SP Jyvaskyla, in which the research took place. SP Jyvaskyla develops and produces professional mobile radio terminals for government officials and public trunking