It's doubly true in software, because adding people not only increases the financial cost, but it increases the communication cost as well. In software, it's very likely that adding people makes you go more slowly, unless you take very careful pains to manage them well (which makes you go more slowly, though hopefully it helps them go fast).
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Mistakes 3, 6, 8 and 14 sound very, very similar to what 37Signals and other web entrepreneur people are saying.
It's doubly true in software, because adding people not only increases the financial cost, but it increases the communication cost as well. In software, it's very likely that adding people makes you go more slowly, unless you take very careful pains to manage them well (which makes you go more slowly, though hopefully it helps them go fast).