Pero en una serie de juicios contenciosos — Defrenne contra Sabena, Barber contra Guardian Royal Exchange y otros — la definición se ha ampliado progresivamente, primero para incluir los derechos a vacaciones y pensiones, etc. y luego para incluir el trabajo de igual valor.
But in a series of contentious judgments – Defrenne v. Sabena, Barber v. Guardian Royal Exchange, and others – the definition has been progressively widened, first so as to include holiday entitlements and pensions and so on, and then so as to include work of equivalent value.