Re engineering a process of rethinking about the existing software, product etc.It is the change in the process the makes the continuous improvement.

2.  “A business process is a collection of activities
which together produce something of value to a
customer”
– e.g. Customer Order Entry

3.  Reengineering is the fundamental rethinking and
radical redesign of business processes to achieve
dramatic improvements in critical, contemporary
measures of performance, such as cost, quality,
service, and speed.

4. BPR changes processes, and
not
functions, departments, geographics or tasks.

5.  Business process reengineering (BPR) is a
management approach aiming at improvements by
means of elevating efficiency and effectiveness of
the processes that exist within and across
organizations.
 The key to BPR is for organizations to look at their
business processes from a "clean slate" perspective
and determine how they can best construct these
processes to improve how they conduct business.

6.  Shared databases, making information available at
many places
 Expert systems, allowing generalists to perform
specialist tasks
 Telecommunication networks, allowing
organizations to be centralized and decentralized
at the same time
 Decision-support tools, allowing decision-making
to be a part of everybody's

7. Efficiency
Control
High Demand
High Competition
Innovation
Speed
Service &Quality