This bachelor thesis deals with data quality. Including what are the problems with poor quality data and common causes of error. The aim of this thesis is to define the nature and problems of data quality. Analysis of the impact of poor data quality on the functions and results of the company. Furrhtermore we will learn the essentials factors influencing the quality of data. This work is divided into two logical parts. The first part is theoretical and deals with the explanation of the concept of data, then we move on to the concept of data quality, its metrics and then we get acquainted with errors in data and their origin. The second part of the work shows us quality management and working with data in a manufacturing factory. This work i...