Head and Shoulders: A Failed Extension Bracketed by Weaker Attempts
The classic three-peak reversal formation, its sloping neckline, correct measurement, and the inverse version.
Head and shoulders describes three peaks: a higher middle peak — the head — flanked by two lower ones. What it summarises is a market that extended once, failed, and could not extend again.
The inverse head and shoulders is the same description in reverse. Both are widely cited and widely mismeasured, mostly because the neckline is rarely horizontal.
The five swings
Left shoulder, pullback, head, pullback, right shoulder — that sequence must exist before the label applies. The two pullback lows define the neckline, and they are frequently at different prices, which makes the neckline a sloping line rather than a level.
Shoulders do not need to be symmetric in price or time. Insisting on symmetry filters out most real examples.
Working with a sloping neckline
When the two pullback lows differ, the neckline is a trendline through them, and the break level moves with time. Many traders simplify by using the lower of the two lows as a horizontal trigger, which is stricter and easier to test.
Whichever convention you choose, use one consistently. Mixing conventions makes review meaningless.
Measurement
The conventional target measures from the head to the neckline directly beneath it, then projects that distance from the break point. On a sloping neckline the measurement point matters, which is another reason to fix the convention in writing.
Inverse head and shoulders
The inverse formation has a lower middle trough between two higher ones, with the neckline drawn across the two intervening highs. The reading, measurement and invalidation logic are mirrored.
Both versions deserve the same context check: where does this sit on the higher timeframe, and is the level being tested significant there?
Common failure modes
The right shoulder that keeps extending into a new high invalidates the shape. A neckline break that immediately reverses is a false break. A third failure is labelling the pattern while the right shoulder is still forming — the most common one of all.
- Right shoulder exceeds the head: no longer the same structure
- Break, then recovery above the neckline: false break
- Label applied before the right shoulder completes: anticipation