摘要：The research was aimed to develop a domino card media that was reasonable and effective in improving Indonesian language mastery for fifth grade students of elementary school.This was a development research that comprised of ten stages.Product in from of a reasonable vocabulary domino card media based on scores obtained form material expert and media expert each with value 80 with a good category.Product effectiveness yielded in improving Indonesian language vocabulary mastery based on a hypothesis test result of sigificance (2-tailed) of 0,034 smaller than 0,05.That domino card media was effective in improving Indonesian language vocabulary mastery for elementary school students.
