One of the most common data acquisition tasks is simply logging acquired data to disk or to a database for future analysis. Most National Instruments data acquisition (DAQ) devices are shipped with free data-logging software. Depending on your data-logging application requirements, you may need additional functionality. This article introduces the three levels of data-logging software available with National Instruments DAQ devices ” NI LabVIEW SignalExpress, NI LabVIEW SignalExpress LE and NI LabVIEW.