Koskela 1992 proposes the flows model as a fundamental pillar of Lean Construction, where the flows or activities that do not add value and the conversions are explicitly distinguished activities that add value.
Koskela 1992 propone el modelo de flujos como pilar fundamental de Lean Construction, donde se distinguen explícitamente los flujos o actividades que no agregan valor y las conversiones actividades que agregan valor.