For example, a company controller may be required to notify management of those expenses that are the greater of TK. 10,000 or 20% higher than expected.
The purpose of the management by exception concept is to only bother management with the most important variances from the planned direction or results of the business. Managers will presumably spend more time attending to and correcting these larger variances.
The concept can be fine-tuned, so that smaller variances are brought to the attention of lower-level managers, while a massive variance is reported straight to senior management.