In some examples, a system derives a first representation of an assembly of components based on a first source of information, and derives a second representation of the assembly of components based on a second source of information that is of a different type than the first source of information, where the second representation includes any or a combination of an indication of a source of a respective component of the assembly of components, or placement location information of a component in the assembly. The system compares the first representation to the second representation to identify a deviation between the first representation and the second representation, the deviation corresponding to an alteration of the assembly of components.