In 1948 Harold Lasswell defined the objective of media communications research as discovering “who says what to whom in what channel with what effect”. The difficulty for researchers has been that for the first half-century or so after Lasswell set out the aim, it has been largely impossible.
1948年，美國傳播學者哈羅德?拉斯韋爾(Harold Lasswell)將媒體傳播學研究的目標定義為：“誰(who)對誰(to whom)通過何種渠道(in what channel)說了什么(say what)，并取得了何種效果(with what effect)”。可研究人員碰到的難題在于，在拉斯韋爾提出該理論五六十年后，這一目標仍然基本上不可能實現。
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