Abstract: Techniques for discovering semantic meaning of data in fields included in one or more data sets, the method including: a first field having a previously-assigned label that indicates a semantic meaning of the first field; identifying a set of one or more candidate labels, for potential assignment to the first field instead of the previously-assigned label; evaluating, using a previously-determined label score and a first candidate label score, whether to assign a first candidate label to the first field, the evaluating comprising: when the first candidate label score is at least a first threshold amount greater than a previously-determined label score, presenting the first candidate label to a user by generating an interface through which the user can provide input indicating whether to assign the first candidate label to the first field instead of the previously-determined label.