Holt-Winters' forecasting models are examples of qualitative and judgmental forecasting methods.

Holt-Winters

A forecasting method that addresses seasonality by applying exponential smoothing to both the level and the trend of the data.

Qualitative Methods

Research techniques that collect data that is not in numerical form such as interviews, observations, and textual analysis.

Judgmental Forecasting

A forecasting method that relies on intuitive judgments, opinions, and subjective estimates rather than on rigorous mathematical models.