Ndị mmekọ Nnyocha Sayensị
Science Research Associates (SRA) bụ onye na-ebipụta ihe agụmakwụkwọ na Chicago na ngwaahịa nghọta ọgụgụ ụlọ akwụkwọ. McGraw-Hill Education nwetara ụlọ ọrụ ahụ na mbido afọ 2000.

Akụkọ ihe mere eme 
E hiwere Science Research Associates Inc. na 1938 na azụmahịa na ọrụ. N'afọ 1957, ọ banyere na ntụziaka klas nke onye ọ bụla na SRA Reading Laboratory Kit, usoro ha sụgharịrị na mgbakọ na mwepụ, sayensị, na ọmụmụ mmekọrịta mmadụ na ibe ya nke a na-akpọkarị Kaadị SRA. Ụlọ nyocha ahụ bụ nnukwu igbe jupụtara na mpempe akwụkwọ kaadị na-acha anụnụ anụnụ, mpempe akwụkwọ ọ bụla gụnyere mmega ahụ maka ụmụ akwụkwọ. Nwa akwụkwọ ọ bụla ga-arụ ọrụ na ya n'onwe ya na ụmụ akwụkwọ ndị ọzọ nọ na klas ahụ, na-agwa onye nkuzi naanị ma ọ bụrụ na ọ tọrọ. Nwa akwụkwọ ahụ ga-esochi ọtụtụ ajụjụ nhọrọ. Ka nwatakịrị ahụ na-aga n'ihu, kaadị ahụ ga-aga n"ihu na ihe isi ike.

IBM zụrụ SRA na 1964. Ka ọ na-erule n'oge a, usoro ụlọ ọrụ ahụ nke ngwaahịa ụlọ akwụkwọ praịmarị na sekọndrị amụbaala. Otu n'ime ngwaahịa ọhụrụ ndị ahụ bụ National Educational Development Tests, usoro ule a na-ere n'ụlọ akwụkwọ dị ka usoro iji nwalee ohere ụmụ akwụkwọ nwere iru eru maka agụmakwụkwọ tertiary.   SRA mepụtara ma IBM PC na Apple II software na 1980s. [citation needed]Maxwell Communication Corporation zụrụ SRA na 1988, ọ ghọkwara akụkụ nke Macmillan/McGraw-Hill na 1989. Maxwell Communications dara, na McGraw-Hill nwetara ikike zuru oke nke Macmillan / McGraw-hill na SRA.

Ihe omume agụmakwụkwọ 
Kemgbe afọ 1960, SRA abụwo onye na-ebipụta mmemme Direct Instruction, nke a makwaara dị ka DISTAR (Direct Instruction System for Teaching Arithmetic and Reading). Ndị a gụnyere Asụsụ maka Ịmụta, Ịgụ Ihe, Ntụziaka na Ide, Ịjikọta Echiche Math na Ịgụ Ihe. SRA nwetara Everyday Mathematics ma zụta Open Court Reading na 1990s.

Na mbido afọ 2000, McGraw-Hill Education zụrụ ụlọ ọrụ ahụ. E mere aha na ngwaahịa ahụ akụkụ nke azụmahịa PreK-12 nke ụlọ ọrụ ahụ. Chee Ya! A malitere usoro ọgụgụ ihe omume na 2007. McGraw-Hill Education na-asọ mpi dị ka onye na-ebipụta mgbakọ na mwepụ na ihe sayensị na mmemme dịka Real Math, Number Worlds na Snapshots Video Science.

Hụkwa 

 Siegfried Engelmann

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