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Software systems are integrated to a wide extent in society. As they are implemented the need for software maintenance arises. The effort and expenses spent on software maintenance are of great magnitude. Software organizations are trying to evolve to be more efficient and improve results upon their clients and stakeholders. A promising way of achieving this is adoption of a process improvement model. This thesis investigates the support for software maintenance in the process improvement framework CMMI (Capability Maturity Model Integration) created by the SEI (Software Engineering Institute). Methods used are a review of the CMMI documentation and a case study of an accredited CMMI organization. The review was performed by reading and searching for maintenance support in the documentation. Quotes were explicit support was found is presented with discussion concerning the possible benefits maintenance work could achieve. The case of the thesis is a large software company with CMMI accreditation. There were 23 employees answering a questionnaire about maintenance and CMMI. The review gives the conclusion that benefits are to gain from CMMI adoption fo