We analyze adverse selection problems in which a signal occurs after con-
tracting that is related to certain components of the agent's multidimensional
type. These components of the agent's type represent information that the
principal would like to utilize. We present illustrative examples and provide
a characterization of when the principal can achieve complete information uti-
lization. Using this characterization, we show that, under broad conditions,
the principal cannot achieve complete information utilization with a binary
ex-post signal structure. However, there are ex-post signal structures with a
finite number of signal realizations that enable complete information utilization.
In proving these results, we develop techniques concerning multidimensional
screening that are applicable to other problems in mechanism design.