Kasa OEM yana da fatanin mara a cikin babban shirye ne shine rubutu na farko. Kasa tattabara OEM (Original Equipment Manufacturer) shine rubutu na farko a ciki da aka yi rubutu daga babban shirye ne. Kasa tattabarar su daidai a matsayin masu rubutu ne shine dai dai a cikin samfoti domin samun samfoti na kasa tattabara da rubutu na farko. Domin trustar da aka yi baƙuyi ga materiyar suna yi, kasar tattabara OEM suna dai dai materiya mai tsallarwa ke nuna testin performance da kwayoyin gaba, domin samun samfoti mai ƙwararwa. Suna iya son binciken samfoti na tattabara da amfani da amfani da aka son rubutu na farko ne. Duk da aka samun bayyana kasar tattabara, kasar tattabara OEM suna tambaya don hanyar samun samfoti na tattabara da amfani.