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A1 عطا الله، صلاح الدين فرح. AB The instrument My class Activities, MCA is one of important instruments to view gifted students in basic education about what is offered to them in their classrooms, MCA has found considerable attention from researchers in the field of gifted and talented. The objective of this research is to verify the indications of reliability, validity of the Arabic version of (MCA), & derivation of its local norms. MCA was administered to (452) of primary school children, from Saudi Arabia & Sudan, (166) male pupils from Riyadh, & (286) male/female pupils from Khartoum. validity calculated in several ways such as: content validity, internal construction, & Construct validity with two different kinds : concurrent validity (By finding the correlation with the scale of positive components of classroom environment), & factorial validity. Reliability calculated by Cronbach’s alpha equation & half-spilt method, and norms were derived. The results showed that the instrument has a good psychometric characteristics which Allow for use in gifted programs, & In the related scientific fields.(Published Abstract) http://search.shamaa.org/abstract_en.gif ID 125434 OP ص ص. 125-161 T1 الخصائص السيكومترية للصورة المعربة من مقياس أنشطتي الصفية (MCA) [مقال] UL 1 http://search.shamaa.org/fulltext.gif http://search.shamaa.org/PDF/Articles/EGMktz/MktzNo87P1Y2015/mktz_2015-n87-p1_125-161.pdf النص الكامل (PDF)