The paper analyses traditional quality control methods for business processes and their efficiency in respect to semi-structured process. We update a classical methodology to handle semi-structured processes: improve its execution and operational efficiency in a company. We propose Some new methods: under the Define step – a new method for describing business processes with the help of semantic maps; under the Measure step – a new method for the automated detection of non-random deviations (bottlenecks, errors); under the Analyse step – a new method for automated experts search to identify the root causes of business process problems based on an analysis of the information field.