予定
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A very everyday sort of plan – go to the movies, go to karaoke with friends.
$$$
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計画
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Pretty close to 予定 in meaning, but perhaps more elaborate – you’d use 計画 to say “I have a plan to get rich!” or to say “I planned out our whole vacation to 3 countries.” . . you wouldn’t use 予定 for that.
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案
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An idea you just had – or a proposal you’re making – to specifically solve a problem.
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企画
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A corporate plan. I.e. to build a high-rise building by 2011, or to release a new type of car.
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策
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Never used by itself.
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