Abstract " A Motor Education Program Based On The Biomechanical Analysis Model As An Indicator Of Effectiveness During The Stages Of Learning The Underhand Strike In Volleyball For Preschool Children." * Dr. Ahmed Ali Mohammed Ali Suwailem  ** Dr. Manar Mahmoud Abdel Salam Shaaban  The research aims to determine the effect of a motor education program according to the biomechanical analysis model as an indicator of effectiveness during the stages of learning the underhand strike in volleyball for preschool children. The researchers used the descriptive approach using the (qualitative motor analysis model) in the stage of identifying the details of motor performance (for the underhand strike in volleyball) then the researchers used the experimental method by following the quasi-experimental design with (pre-, inter- and post-) measurement for one experimental group in the phase of applying the proposed program. The research community included children in the kindergarten stage at the Experimental Language School, in the West Zagazig Administration in the Sharqia Governorate, for the academic year (2024/2025 AD), and their number was (60) boys and girls. The researchers selected (20) children from the second level, representing the experimental group, in addition to (10) children for the exploratory study from the research community and outside the basic sample. The results of the current study showed that the technical performance and errors evaluation form had acceptable indicators of validity and reliability, which supports its use as an objective scientific tool in analyzing and evaluating the level of technical performance of the skill (underarm strike in volleyball). The results indicate that applying the “High-Ward” model for qualitative analysis represents an effective means of evaluating the technical performance of the skill (serving from the bottom facing), as it provides an organized scientific framework for teachers to identify and diagnose performance errors in the early stages, which contributes to accelerating the process of correct learning of motor skills. The researchers recommend the necessity of adopting and applying qualitative analysis models in evaluating the level of technical performance, specifically performance errors for the skill. (Send from below facing) This approach contributes to providing objective and organized monitoring of technical aspects and errors in motor performance.