Improvement in organisation requires problem elimination through root cause analysis. Corrective actions to prevent recurrence of the problem and preventive actions to prevent the occurrence of the problem is to be ensured. For carrying the root cause analysis, collection and analysis of the data is required. For this various QC tools, more particularly the 7 QC tools, popularised by Deming finds application. These tools include, checksheet, Ishikawa or fish bone diagram, Pareto diagram, Scatter diagram, Brain storming, Flow chart, Histogram, and Control Charts. This book gives the basics of these tools, the procedure required to be adopted for application and illustrates the application through the use of EXCEL as well as MINITAB. It covers all the control charts, variable as well as attribute. The exercises for working are also provided. The personnel who are new to QC tools , professionals, consultants, students, six sigma green belt and those interested in learning about the QC tools will find this book extremely useful. The presentation is easy to understand and supported by examples.