软件开发成熟度.ppt

Process improvement
Concepts and cmmi
Module2
Topics
E Process Improvement Concepts
The cmmi products suite
CMMi in the business
Summary
What is process?
a How do you define process?
General definitions of process
a Process-a sequence of steps performed for a given
purpose(Ieee)
a process- the logical organization of people, materials
energy equipment and procedures into work
activities designed to produce a specified end result
(From Pall, gabriel A. Quality process management
Englewood Cliffs N.]: Prentice-Hall, 1987)
a Process-activities that can be recognized as
implementations of practices in a model (CMMi
glossary)
The process management Premise
a the quality of a system is hig hly influenced
y the quality of the process used to
b
acquire develop and maintain it
a This premise implies a focus on process as
well as on products
a This is a long-established premise in
manufacturing
D Belief in this premise is visible worldwide in
quality movement in manufacturing and service
industries(e. g. ISo standards)
This premise is also applicable to development.
Quality leverage points
Everyone realizes the importance of
having a motivated, quality work force
but
PEOPLE
a a even our finest people
ECHNOLOGY
can't perform at their
PROCESS
best when the process
is not understood
IS
not u
odor
operatin
“ at its best
Major determinants of product
cost, schedule, and quality
Immature processes
Processes are ad hoc and improvised by practitioners
and their management
a Processes descriptions are not rigorously followed or
enforced.
a Performance is highly dependent on current
practitioners.
a Understanding of the current status of a project is
limited
D Immature processes result in fighting fires
i No time to improve-constantly reacting
Firefighters get burned
Embers may rekindle later
Mature processes=fire prevention
D Processes descriptions are consistent with the way
work actually g