private double effortNominalPerStrategyMet(Strategy str, Metier metier, TimeStep step) {
    Month month = step.getMonth();
    StrategyMonthInfo smi = str.getStrategyMonthInfo(month);

    double propSetOfVessels = str.getProportionSetOfVessels();
    int nbOfVessels = str.getSetOfVessels().getNumberOfVessels();
    double propStrMet = smi.getProportionMetier(metier);
    double effortNominalPerVessel = effortNominalPerStrategyPerVessel(str, metier, step);

    if (log.isDebugEnabled()) {
        log.debug(
                " strategy=" + str +
                " metier=" + metier +
                " propSetOfVessels=" + propSetOfVessels +
                " nbOfVessels=" + nbOfVessels +
                " propStrMet=" + propStrMet +
                " effortPerVessel=" + effortNominalPerVessel
        );
    }

    double result = propSetOfVessels * nbOfVessels * propStrMet * effortNominalPerVessel;

    return result;
}