# People time is important when there is a clear critical path
There’s a fairly common refrain that it’s engineering when you can just pour money into it. (This is also what I have called a [[Little h hard problems need a bunch of engineering effort but no breakthroughs]]). That means that you are bound by *people time* and if you can pay more people to spend more time on it, it will go faster. In order to do this, you need a clear idea of what inputs lead to what outputs — in other words, a [[Critical path]].
However, there are many things (when there’s high uncertainty) where you can’t just *go faster*
### Related
* [[raoGUTSGrandUnified2018]]
* [[Little h hard problems need a bunch of engineering effort but no breakthroughs]]
* [[Big H hard problems are those that need a discovery to solve]]
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