Citi's innovation chief reveals how they kill tech projects without offending the people who came up with them

D10X is Citigroup's internal incubator in which employees from across the firm come up with ideas for potential technology solutions.
Vanessa Colella, Citi's chief innovation officer, explains how the bank tries to decide when an idea should no longer be pursued in the least awkward way possible. When do you pull the plug on internal tech projects? 
It's a critical question anyone involved in the innovation process must constantly consider. If not, a firm risks wasting millions of doll