(Technology) Forecasting is sometimes considered, together with strategic planning, to be one of the ancestors of Foresight. It used to be considered as the approach to envisage the future. It is by definition normative and aims at predicting (technological) developments on the basis of the extrapolation of perceptible trends.
Nowadays, it is increasingly considered as one input in the foresight process among others, rather than a 'stand alone' method. It may involves the use of time-series data from the past to extrapolate the likely path of future trends or the possible occurrence of future events.
Typical forecasting methods include: