For a business to be successfull it is important to resolve the problem at timely basis. If problems are not resolved they will result in slower process, higher faults hence increasing costs and decreasing quality. These are all those things which are not favaourable for sustainability of business. But in order to solve the problem it is important to know what exactly the problem is, so that all energy and resources should be directed towards that particualr problem. Sometimes small problems are having huge impact on performance of business. In order to identify those problems business processes need to be analysed in much more detailed way. For that numbers can assist to study something in as lower fraction as possible. Numbers do speak, but in order to understand them they need to be anaylsed by putting them in some formula or model. There are some models like taguchi model and control charts which can help to idetify and understadnd problem in much better way. This will help to reduce variations in systems, if the problems are understood and resolved. Reduced variation helps to minimize cost of prduction in terms of less faulty products and low wastage of resources, and on other hand quality will improve. As product with very similar specification will be produced from processes everytime. Problem is always decreasing quality. And thast what customer pays premuim and help to branding of business. In order to resolve problem it is important to understand it in best possible manner.