Some of the most expensive fighters such as the US F-14 Tomcat, F-15 Eagle, F-22 Raptor and Russian Su-27 were employed as all-weather interceptors as well as air superiority fighter aircraft, while commonly developing air-to-ground roles late in their careers.
The health service measures that best predict subjective health status should be identifiable. Following her further degree in clinical epidemiology and biostatistics, her interest turned to the development of methods to measure subjective health status.
Objective and subjective performance measures. 1  1. Objective and subjective performance measures Measuring and appraising the quality of a performance can be a challenging task particularly where the performance is not easily timed or measured. 2  2. To stimulate logical and creative thinking: It is also an opportunity to train and develop good habits.