speaking about deck failure,  here's some things you can do to lesson the ods. If you are pouring, lets say the fifth flour, take the man lift to the 4th and look around, does it look safe?  You may not know at first, but in time you will. So lets say, when pouring concrete stand next to a sheer wall or column, not on the edge by the handrail. I have been doing this 26 years and have seen three deck failures and so far this has saved my life at least once.

hey concretesteel I will keep the advise in mind, I pump a lot of decks but been very lucky with no problems.

Bob made a comment not long ago that was on target,awareness.Going under a deck and checking is not always the case to an untrained eye.Usually there is a warning,the question is did you reconize it.Alot depends on the system contractor is using.In the case of 4x4 shoreing a pop under you,sometimes it can be heard and felt.Once on the floor below me and once 3 floors below inside the hospital,both times faulty 4x4's.Pouring on tin is a different animal altogether,metal bends before it fails.Keep in mind most of the time we are probably loading these decks faster than they can absorb the weight.Have I been on a deck that failed "yup" but to young to know how to spot the indicators.We put alot of confidence on crews under us checking the forming while we pour.They may be experienced but what if.