was not originally intended as a reduction package for single-dish data and cannot be considered as such today. However, because of the similarity of single-dish data taken at “random” pointings on the sky to interferometric data taken at “random” locations in the uv plane, was seen as a system to be used to solve large imaging problems arising from single-dish observations. Many of the uv-data tasks are able to do something sensible — or even desirable — with single-dish data and a few special tasks to process single-dish data have been written. The present chapter contains a discussion of the representation of single-dish data in followed by a description of how such data may be calibrated, corrected, converted into images, and analyzed by . A final section on using single-dish observations to improve the imaging of interferometric data represents what little we now know about this potentially important process.