
The figure shows the 48 month running mean
of T. Heidke skill score for seasonal forecast of
US surface temperature. Each score plotted is
an average of scores over the last 48 three month "seasons" over a four
year period. This skill score has been established as GPRA* performance
measure.
* The requirement to demonstrate
program impact was mandated in 1993 through the
Government Performance and Results Act (GPRA). GPRA
required all Federal agencies to develop strategic plans to ensure that
services were delivered efficiently and in a manner that best suits client
needs, and to develop indicators of performance to demonstrate their
agency's impact.