Sometimes the optimization process results in weights near zero or one. For Simple or Double (Brown) Exponential Smoothing, a level weight near zero implies that simple differencing of the time series ...

0.1, or even long moving averages are best. If a change from single to double exponential smoothing gives a significant improvement in the forecast for an item, then perhaps more sophisticated methods ...

Crane, D. B., and James R. Crotty. "A Two-Stage Forecasting Model: Exponential Smoothing and Multiple Regression." Management Science 13, no. 8 (April 1966).

The FORECAST procedure includes the following features: choice of the following four forecasting methods: exponential smoothing: single, double, triple, or Holt two-parameter smoothing stepwise ...