A method of conditionally formatting a display of data is disclosed that involves providing a preliminary display automatically showing the intended consequences of the condition applied to the data prior to making the condition actually apply to the data. This is especially useful in analysis of spreadsheet data by conditionally formatting certain data. The method involves identifying one or moreparameters of the data to be conditionally formatted on the display, selecting a predetermined condition; and automatically applying temporarily the predetermined condition to the parameter(s), displaying a temporary preview on the display of the predetermined condition applied to data that meet the predetermined condition. The method also provides the capability to preliminarily change the conditions and parameters applied to the data and automatically provide appropriate previews of the effect of such application of changed conditions on the displayed data.