This is the degree in which a data entity meets the desired format in storage and exchange. Take for example the domain yet also the datatype of the attributes of a data entity. Within chain exchange for example this is of the highest importance. Nobody wants to find out that at the end of the chain the data is not valid. This needs to be detected in an early stage. Everyone knows the examples from the past with web applications where after sending a message “invalid data” showed up without further explanation.