Methodical aspects of work timekeeping and simulation tests of effective time consumption at logging

abattage d'arbres aplicaciones del ordenador application des ordinateurs aprovechamiento de la madera besoin en main d'oeuvre bois computer applications corta demanda de trabajo estudio del trabajo felling forest products horas laborables labour requirements logging madera main d'oeuvre mano de obra manpower mathematical models measurement mesure methode methods organisation du travail productos forestales produit forestier simulation temps de travail wood work organization work study working hours