In the last two decades, the Brazilian consuming market was modified by the insertion of products of better quality and minor cost. Statistical Process Control (SPC) and control charts look after significant characteristics products and processes, in real time, guaranteeing quality levels, in a cost demanded by the market. In that context, an important procedure is the interpretation of the control charts; this is made through non-random patters. A study was made illustrating and arguing such standards. Standards had been illustrated and one revealed which of them, rejected the nullity hypothesis, under a determined significance. One concluded that the standards mentioned in literature are not so informative and can be improved.
Statistical Process Control; Non-random patters; Under control process; Special causes; Control charts
