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The purpose of present study was to investigate predictions of challenge point theory (guadagnoli and lee, 2004) through comparing two group of challenging and nonchallenging games in developing manipulative fundamental movement skills. Thirty 4 to 6 years old child were selected from one of the kindergartens of Tehran and were grouped according to pretest scores. The games were used were designed for developing manipulative skills in both groups, however the task difficulty of these games was increased in challenging group while in nonchallenging group it was kept constant. The intervention was 8 weeks, 2 session for each week and 42 minutes for each session. Children's manipulative skills were assessed using Test of Gross Motor Development – second version in the beginning and the end of the intervention. The results of multivariate analysis of variance showed  that improvement groups in total score of manipulative skills and all subscales exept that catching wasn't significant. In total, if the challenge point theories predictions on developing of manipulative skills of healthy children failed to be proved but better improvement of challenging group in catching shows that this method is more effective in developing complex skills.

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The purpose of this study was to determine the relationship between movement motivation and motor development in infants with and without the experience of kindergarten. The population of this study included all parents with infant's boys with 10 to 11 month in Tehran. Among them, 150 infants with and 150 infants without the experience of kindergarten using the multi-stage random sampling the method was selected as the sample groups. Data collection tools included an infant movement motivation questionnaire and Peabody Developmental Motor Scale–Second Edition (PDMS-2), the data analysis was done using Pearson’s correlation coefficient, linear regression, and t-test in a significance level of p≤0.05. The results showed that there was a significant relationship (P=0/000), between movement motivation and motor development in infants with and without the experience of kindergarten. In the same context, a significant difference (P=0/000), was obtained in movement motivation and motor development between of infants with and without kindergarten experience and infants without the kindergarten experience, movement motivation, and motor development was higher. These results indicate that care of infants in kindergarten Centers may be due to the weakness of the programs and facilities have negative effects on of them movement motivation and motor development.