Earned Value Management (EVM) is a wonderful management system, integrating
in a very intriguing way, cost …schedule …and
technical performance. It is a system, however, that causes
difficulty to those just being introduced to its concepts.
EVM measures schedule performance not in units of
time, but rather in cost, i.e. dollars. After overcoming
this mental obstacle, we later discover another quirk of
EVM: at the completion of a project which is behind schedule,
Schedule Variance (SV) is equal to zero, and the Schedule
Performance Index (SPI) equals unity. We know the
project completed late, yet the indicator values say the
project has …perfect schedule performance!!
the long-standing dilemma of the EVM schedule
indicators providing false information for late
Earned Schedule (ES) is a breakthrough analytical
technique that resolves the EVM dilemma. It is derived
from and is an extension to EVM. No additional data
is needed for acquiring the ES measures; only the data
from EVM is needed. In contrast to the cost-based
indicators from EVM, the ES schedule performance indicators
are time-based, making them easier to comprehend.
The ES indicators provide a status and predictive ability
for schedule, analogous to the facility for cost using
the ability to predict project completion dates
and is the bridge for performing meaningful schedule
analysis from the EVM data.
Because the Earned Schedule metrics use
time based measures, they augment traditional EVM and
Earned Schedule is the bridge between EVM and schedule
analysis. It has been shown that ES can be used for
detailed schedule analysis and that it has
the potential to improve both cost and schedule prediction
This site aggregates the available information concerning
Earned Schedule (published papers, conference presentations
and terminology) and provides the availability to download
the ES calculator spreadsheet. News concerning ES
is posted for keeping everyone as informed as possible.
Also, for convenience, we have listed in Contacts those
available to provide assistance with your application.
Sites of interest are identified which may help in your
search for an answer to your question or problem.
It is noted that Earned Schedule has been integrated into EVM guidance. Significantly, the International Standards Organization has included ES in its recent publication, ISO 21508:2018, Earned Value Management in Project and Programme Management.