Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for executing a first operation using a first system, the first operation generating first output data, generating a first fieldset, the first fieldset including one or more fields corresponding to the first output data, populating the one or more fields of the first fieldset with values of the first output data, transmitting the first output data to a second system, executing a second operation using the second system, the second operation generating second output data, the second output data overlapping the first output data, generating a second fieldset, the second fieldset including one or more fields corresponding to the first output data and the second output data, and populating the one or more fields of the second fieldset with values of the second output data.