Judo requires the participation of several motor skills, so constructing one-dimensional tests that monitor the athlete's progress is not an easy task. The aim of this paper was to determine whether there is a connection between the level of motor skills assessed through basic tests and results in complex/multidimensional specific judo tests in children between 9 and 12 years old, and to determine whether this connection will be the same for judokas of different chronological age and training experience. The sample of respondents consisted of 10 boys and 10 girls, judo athletes who have been training for more than 3 years at least 2 times a week. The sample of variables to assess motor skills consisted of three specific tests in judo: throw 2 push-ups 16 cycles (BAC2SKL16) to assess endurance, connected falls (MSCU) to assess coordination and alternating entries in ippon seoi nage throw (Uchi-komi) (MSSU) to assess speed and six basic motor tests: range backwards (MAGPOL) to assess coordination, standing long jump (MESSDM) to assess strength, 800m running test (MES800M) to assess general endurance, Cating 15s (MFRCAT) to assess speed, Flamingo test (FLB) ) to assess balance and leaning forward on a bench (MFLPRK) to assess flexibility. The results showed a connection between the basic and specific tests only in the BAC2SKL16 test, while the results in the more complex MSCU and MSSU tests did not show a connection with the results of the basic one-dimensional/simpler tests. The results showed that there is no significant correlation regard to age and gender