Swing trades often revolve around patterns, like Harmonic patterns and breakout patterns. Harmonic patterns are price action based, and geometric patterns are bumped up a notch using the Fibonacci sequence to help identify turning points for the market. Traders use these patterns to determine when and how a market will move, highlighted by people like H.M. Gartley in his book Profits in the Stock Market.
The strength of an automated trading strategy becomes apparent, as you can set predetermined rules to trust the plan and lower the risk of a swing trade based on the patterns. This comes from adding stop-losses in and being completely based on market data rather than a gut feeling.