def METHOD_NAME(sig):
    errisr = getISRerr(sig)
    isrHighWeights = addWeight(configMgr.weights, str(1 + errisr))
    isrLowWeights = addWeight(configMgr.weights, str(1 - errisr))
    isrUnc = Systematic("ISR", configMgr.weights, isrHighWeights,
                        isrLowWeights, "weight", "overallSys")
    return isrUnc