Development of problem-solving and creative thinking ability was examined through administration of experimental tasks to 240 gifted children (grade 2 to grade 6). Different patterns of development were noted: problem-solving skills grew steadily from grade 2 through grade 6; while creative thinking increased from grade 2 through grade 4, with no significant increase thereafter. A comparison of scores on problem-solving and creative thinking tasks for 160 nongifted children (grade 5) with those of the gifted Ss revealed that the gifted Ss were approximately two years ahead of the nongifted Ss on all measures. (IM)