A considerable amount of research has taken place since the late 1970s concerning vocabulary memorizing
strategies. Among the earliest studies that focused on memory strategy for vocabulary are those by Cohen and
Aphek whose main interest was use of association. In one study Cohen and Aphek (1980) found that making
associations and keeping using them were helpful to recall it. In another study Cohen and Aphek (1981) found that
more successful associations would be the ones in which two items were closer in sound or meaning, or which had
an emotional impact on the leaner.