2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/201734I report on a numerical program, which can be used to calculate any infrared safe three-jet observable in electron-positron annihilation to next-to-next-to-leading order in the strong coupling constant alpha_s. The results are compared to a recent calculation by another group. Numerical differences in three colour factors are discussed and explained.6 pages, minor changesHigh Energy Physics - Phenomenologytext