عبد الرزاق علي 2022. The Effect of flexible groupware strategy according to the classification of the field (contemplative - impulsive) in teaching the skill of crushing hitting with volleyball for students of the second stage of the College of Physical Education and Sports S. Wasit Journal of Sports Sciences. 9, 3 (Aug. 2022), 180–193. DOI:https://doi.org/10.31185/wjoss.56.