The research aimed to identify the effect of both immediate feedback (first experimental) and deferred feedback (second experimental) on the level of technical performance in abdominal crawling swimming, and the researcher used the experimental approach on a sample of (20) beginners who were divided into two experimental groups of each. (10) Beginners, and from research tools: Technical performance assessment in abdominal crawling swimming - pictorial intelligence test - educational program using feedback methods. The statistical methods used: the arithmetic mean - the standard deviation - the median - the torsion coefficient - the "t" test - the simple correlation coefficient - the rates of improvement. Among the most important results: 1- The use of computer-supported instant feedback method has a statistically significant positive effect at the level of (0.05) in learning and mastering technical performance in abdominal crawling swimming (first experimental group). 2- The use of computer-supported deferred feedback method has a statistically significant positive effect at (0.05) level in learning and mastering technical performance in abdominal crawling swimming (second experimental group). 3- Increasing the effectiveness of the immediate feedback method over the deferred feedback method in positively affecting learning and mastering the technical performance in abdominal crawling swimming. 4- The use of immediate feedback increases the rates of improvement in the post-tribal measurement in the level of technical performance in abdominal crawling swimming compared to the delayed feedback. Among the most important recommendations: 1- Using the computer-supported instant feedback method to learn and master abdominal crawling swimming for beginners.