Methods, systems, and apparatus, including computer programs encoded on computer storage media, for generating conditional validation rules. One of the methods includes rendering a plurality of cells arranged in a two-dimensional grid having a first axis and a second axis, the two-dimensional grid including one or more subsets of the cells, each subset associated with a respective field of an element of the dataset, and multiple subsets of the cells extending in a direction along the second axis of the two-dimensional grid, one or more of the multiple subsets associated with a respective validation rule. The method includes applying one or more validation rules to an element of the dataset based on user input received from at least some of the cells. A condition cell associated with a field includes an input element for receiving input.