Understanding Price Movement
To gauge the strength of a given S/R level, and thus predict whether or not the price is likely to break through, it is important to look at how well the S/R level fulfills the IRATE criteria. IRATE stands for Indicators, Round Numbers, Age, and TEsted. Each of these factors contribute to the likely strength of the support/resistance level.
Learn all about the IRATE criteria and support/resistance levels here