In some processes as concrete cast-in for different structural elements, the number of staff involved is higher than required. In beams construction process, time is mostly contributive because only well trained workers are required for specific jobs, such us beams formwork and measuring verticality of a camber piece.
En la construcción de vigas, el tiempo es en su mayoría contributivo debido sólo se requieren personal capacitado para trabajos como cimbrado de vigas y medir la verticalidad de la formaleta.