The aim of this research was to determine the effect of two different metric protocols, the
present standard and a new protocol with a video demonstration of the task, on reliability and
homogeneity of motor skills assessment tests for the students in primary education. The
sample of participants comprised ofstudentsin the third and fourth grades from four
elementary schools in the urban area of Petrinja and Sisak in Croatia. The total number of
students that participated was 327, consisting of 186 boys and 141 girls aged 10.5 years. The
students were divided in two subsamples, based on the protocol applied. The sample of
variables consisted of 4 motor skills assessment tests: Shuttle-run, Partial Curl-up, 90° Pushups, Back-saver sit and reach.The results of metric characteristics of composite testing in the
field of motor skills have shown a high level of reliability, homogeneity and sensitivity of
tests after both protocols were applied. Based on the reliability coefficient, the test called
90°Push-ups can be used further by using the video demonstration protocol, with a few trials
before the application, while the test called Partial Curl-updoes not allow the use and
application of the test in this form and using this method. The research shows that, with
correction of some tests, the new protocol with the video demonstration has better results of
metric characteristics of tests compared to the standard protocol.