Two terms that come up constantly in Smart Money Concepts trading are break of structure and change of character, often shortened to BOS and CHoCH. These concepts form the backbone of how many traders identify trend direction and spot potential reversals before they become obvious to everyone else watching the same chart.
Market structure itself is the foundation you need to understand first. In an uptrend, price makes a series of higher highs and higher lows. Each pullback finds support at a level higher than the previous pullback, and each rally pushes to a new high above the last one. In a downtrend, the opposite happens, price makes lower highs and lower lows, with each bounce failing below the previous high and each decline pushing to a fresh low. This simple pattern of higher highs and higher lows, or lower highs and lower lows, is what traders mean when they talk about market structure.
A break of structure happens when price continues in the direction of the existing trend by breaking past a significant prior high or low, confirming that the trend is still intact and likely to continue. In an uptrend, a break of structure occurs when price breaks above the most recent significant high, essentially confirming buyers are still in control and the higher high, higher low pattern remains valid. This is typically viewed as confirmation to continue looking for long entries, not necessarily a reversal signal.
A change of character is different, and this is where things get more interesting for traders looking to catch reversals early. A CHoCH occurs when price breaks structure in the opposite direction of the established trend, essentially the first sign that the character of the market may be shifting. In an uptrend that's been making higher highs and higher lows, a change of character would occur when price breaks below the most recent higher low, something that shouldn't happen in a healthy uptrend. This break signals that sellers may be taking control, and the uptrend could be transitioning into a downtrend, or at minimum entering a period of consolidation before any further move higher.
The distinction between these two concepts matters because they tell you fundamentally different things. A break of structure confirms trend continuation, while a change of character warns of a potential trend reversal. Traders often use CHoCH as an early warning to tighten stops on existing positions in the direction of the old trend, or to start looking for reversal setups in the new direction, while using BOS as confirmation to stay confident in an existing trend and look for continuation entries on pullbacks.
Combining this with order blocks and fair value gaps creates a more complete trading framework. A common sequence looks like this, price shows a change of character signaling a potential trend shift, then price pulls back into an order block or fair value gap that formed during the initial reversal move, offering a defined entry point with a clear invalidation level if the reversal thesis turns out to be wrong. This combination of structure analysis with these supporting concepts is essentially the core methodology behind a lot of Smart Money Concepts trading approaches.
One important nuance here is that structure should generally be analyzed on multiple timeframes rather than just one. A change of character on a 15 minute chart might just be normal noise within a larger uptrend still clearly intact on the daily chart. Understanding which timeframe's structure actually matters for the type of trade you're taking, whether that's a quick intraday trade or a multi week swing position, helps avoid getting faked out by structure shifts that don't actually matter for your particular trading timeframe.
Like every concept in technical analysis, structure analysis isn't perfect and doesn't work in isolation. False breaks happen, where price appears to break structure only to reverse right back in the original direction shortly after, sometimes intentionally engineered by larger players to trigger stops and trap traders before the real move happens. This is exactly why combining structure with volume, other confluence factors, and proper risk management through defined stop losses matters so much, no single concept should ever be treated as a standalone, guaranteed signal.