| In some cases, a back-of-the-envelope estimate is sufficient to make a pass-fail determination. |
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| Third, a back-of-the-envelope calculation suggests that the present study should be little affected by these timing issues. |
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| It's back-of-the-envelope stuff with lots of assumptions. |
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| A lot of this is back-of-the-envelope stuff. |
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| The back-of-the-envelope calculations below provide some guidance. |
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| Here's how a back-of-the-envelope assessment looks. |
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| A back-of-the-envelope calculation suggests that it can. |
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| That back-of-the-envelope figure isn't disastrous. |
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| Let's try back-of-the-envelope calculations. |
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| Do some back-of-the-envelope calculations before all the facts come in. |
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