2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42743I review progress on investigations concerning top quark physics and QCD at a future linear e+e- collider that has been achieved since the presentation of the TESLA technical design report in spring 2001. I concentrate on studies that have been presented during the workshop series of the Extended Joint ECFA/DESY Study on Physics and Detectors for a Linear Electron-Positron Collider.Two references added. 7 pages, 8 postscript figures, to appear in the proceedings of "The 4th ECFA/DESY Workshop on Physics and Detectors for a 90-800 GeV Linear e+e- Collider", NIKHEF, Amsterdam, The Netherlands, April 2003High Energy Physics - Phenomenologytext