A quality measurement (QM) is a measure for the ongoing assessment of the language quality. This is particularly important when using machine translation. Here, the speeds of post editing are measured using productivity measurement methods (e.g. time-to-edit, see also TAUS, DQF). So you know when to retrain or replace engines. Ideally, quality measurements are automatically carried out during translation and the post editing process (see also post editing, translation quality).