Quote:The common belief of the judo community is simply that the practice of Uchikomi (formerly called Butsukari) improves throwing skills. Only within the last several decades since sports psychologists clearly pointed out that judo being a dynamic motor skill,that to practice the skill(s) in part does not improve skill acquisition. This simply means in order to improve throwing skills that throws must be completed in practice in an environment which resembles as close as possible the environment encountered in the performance of randori and shiai! The practice of Uchikomi involves the application of throws to the culmination point, or what is commonly known as kake. Instructors will typically have students perform the Uchikomi for a specified number of times prior to executing the total technique.
http://judoinfo.com/uchikomi.htm