# Little h hard problems need a bunch of engineering effort but no breakthroughs This concept roughly maps onto the Engineering in Research/Engineering or Development in R+D By contrast [[Big H hard problems are those that need a discovery to solve]] Another framing on this is that in little h hard problems the [[Critical path]] are known and the thing that matters is people time ( [[People time vs clock time]]) <!-- #mental-model --> [Web URL for this note](http://notes.benjaminreinhardt.com/Little+h+hard+problems+need+a+bunch+of+engineering+effort+but+no+breakthroughs) [Comment on this note](http://via.hypothes.is/http://notes.benjaminreinhardt.com/Little+h+hard+problems+need+a+bunch+of+engineering+effort+but+no+breakthroughs)