Shift Left Testing Approach uses information from the business requirements to start the testing process. This includes using the list of requested features to create test cases, expected transaction volume as targets for performance testing, and business priority to prioritize test case execution. Shift Right Testing Approach uses operational information to start the testing process. This includes using complaint data to enrich regression test cases with the most complained about features and existing revenue data to prioritize test execution. Both Shift Left and Shift Right approaches are used together in testing to improve test quality by starting with different types of early input information.

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#3 – Shift Left & Shift Right Testing Approach
Shift Left Shift Right
Business Requirement Operational Information
TESTING
Shift Left Testing Approach is an approach in doing testing
where we start the process by using all information in the
Business Requirement.
Shift Right Testing Approach is an approach in doing testing where
we start the process by using the Operational information.
List of requested
features/capabilities.
Expected transaction volume.
Revenue target
Business user & requestor
information
Project timeline and the
phasing
Business priority
Incident and Service
degradation data
System performance data
Top 10 features that have most
error
Top 10 menu/feature that
accessed by users
Existing transaction volume
Existing revenue and the most
contribution service
Requirement complexity.
Use all these information as
input and consideration to do
all activities in a testing cycle,
such as :
▪ Use list of requested features
to create the test cases.
▪ Use expected transaction
volume as target load in
performance test.
▪ Use business priority to
prioritize the test case
execution.
Complain data
Shift Left Approach is the basic approach that used in doing testing process. And todays, as the enrichment , Shift Right Approach
also used together with shift left approach. The objective is to improve the quality of testing process deliverable.
Use all these information as
input and consideration to do
all activities in a testing cycle,
such as :
▪ Use complain data to enrich
the test case of regression
test with most complained
features.
▪ Use existing revenue data to
prioritize the test execution.
▪ Use system performance
data to enrich the test
scenario of performance test