This was a field research (literature review and exploration) with descriptive
quantitative approach. This study aims: (1) to develop a model (scheme) to
assess mathematical power, (2) to test the validity of instruments of
mathematical power assessment, and (3) to developa valid and reliable test
and non-test instrument prototypes as a mathematical power measurement.
The research instruments consist of 4 items of essay test, 20 sheets of
observation on investigative activities, and 20 items of questionnaires.
Validity test was conducted through constructions built up from 3 aspects of
mathematical power ability. Result of instrument analysis showed that: (1)
the r of instrument test = 0.947, meaning that the instrument is reliable, (2)
the r of activity observation sheets = 0.912, meaning that the instrument is
reliable, and (3) the r of questionnaires = 0.770, meaning that the
questionnaire is reliable on 0.05 significance level. This study concludes: (a)
the steps in the model (scheme) of mathematical power assessment may be
used as a reference for assessing mathematical power, (b) test and non-test
instruments are valid and reliable, and (c) prototypes of test and non-test
instruments may be used as a measurement in mathematical power
assessment