||CMMI: CMMI® for Services, Version 1.2
SP 2.1 Obtain Measurement Data
2.1 Obtain Measurement
Obtain specified measurement
The data necessary for analysis are obtained
and checked for completeness and integrity.
- Base and derived measurement data
- Results of data integrity
- Obtain data for base
collected as necessary for previously used and newly specified base
measures. Existing data are gathered from project records or elsewhere
in the organization.
that data that were collected earlier may no longer be available for
reuse in existing databases, paper records, or formal
- Generate data for derived
newly calculated for all derived measures.
- Perform data integrity checks as close to
the source of data as possible.
All measurements are subject to error in specifying
or recording data. It is always better to identify these errors and
sources of missing data early in the measurement and analysis
include scans for missing data, out-of-bounds data values, and unusual
patterns and correlation across measures. It is particularly important
to do the following:
- Test and correct for
inconsistency of classifications made by human judgment (i.e.,
to determine how frequently people make differing classification
decisions based on the same information, otherwise known as
- Empirically examine the
relationships among measures that are used to calculate
additional derived measures. Doing so can ensure that important
distinctions are not overlooked and that derived measures convey
their intended meanings (otherwise known as “criterion