First: models
According to Gann, models always reflect the study of
patterns of price movement , For example the trend is bullish when price
penetrates the summits and will be bearish when it broke bottoms , so trader
can get this information from the movements of the market and the size of its
movements and time of the move, this reflects the price (move, size, time,
duration) which are associated with the pattern, in addition to that trader can
draw these patterns