A fourth study of the impact of classroom assessment practices on students and their learning in the context of the classroom was undertaken by Bangert-Drowns, Kulik, and Kulik (1991), who investigated the effects of frequent classroom testing.
A hyphen (-) is a punctuation mark used to join the separate parts of a compound word. A hyphen is a joiner. A hyphen is used to join the words of a compound adjective (e.g., five-page document), to join the words of compound noun (e.g., cooking-oil), and to join a prefix to a word (e.g., re-examine).
A single - is a hyphen used when you are joining words (e.g. off-site) or when separating syllables or prefixes (e.g. pre-election). aration. A double -- is a dash and is used as a punctuation mark--when one is trying to separate a parenthetical expression--in sentences. There are more uses for both hyphens and dashes.