What DUC has done, DUC-01 - DUC-04 ? ------------------------------------ Investigated summarising 1) for single documents, multi-documents. 2) for news material. 3) at various lengths. 4) of various sorts including generic author-reflecting, viewpoint-oriented, novelty capturing, query-oriented. 5) comparing system summaries with manual ones, and (automatic) baseline ones. 6) using a range of evaluation criteria and performance measures including intrinsic ones - quality, coverage of reference summary content units, ngram coincidence with reference summary, and extrinsic ones (simulated) usefulness and responsiveness. 7) in moderate scale experiments. 8) over a series of task and evaluation development cycles.