  This paper traces the history of Maturity Models and their impact on Process
Improvement from the early work of Shewhart to their current usage with DevOps.
The history of modern process improvement can be traced at least to Shewhart.
From his foundational process contributions and those of other innovators a
variety of methods and tools to aid in process quality advancement were
developed. This paper begins by reviewing those early steps and then focuses on
the emergence of Maturity Models in the 1970s with initial approach by Nolan.
The broad adoption of Maturity Models that followed through the success of the
CMM and then the CMMI approaches is detailed. This then leads to a general
survey of additional models developed for such areas as IT Service Management,
ITIL, Project Management, Agile Development, DevOps, CERT, and MDM among
others. Finally, this paper discusses the application of these models in the
support of process improvement and their limitations. Readers of this paper can
expect to gain an appreciation for the origins of these models and surrounding
methods as well as an ability to conduct comparative analysis of such models to
aid in their selection and application.
  Keywords: Process Improvement, Process Engineering, Maturity Models,
Capability Maturity Models, CMM, CMMI, ITSM, ITIL, Agile, DevOps, History of
Science, History of Computing, Software Engineering, Quality.
