High-quality data are the ____ for analyzing and using big data and for guaranteeing the value of the data. ____, ____ analysis and research of quality standards and quality assessment methods for big data are ____. This paper ____ the most ____ reviews of data quality research, most ____ by Ilyas,Kirinyet and Moreno ____, and analyzes the data characteristics of the big data environment. Following ____, it presents the quality challenges faced by big data, and formulates a hierarchical data quality ____ from the perspective of data users. This framework consists of big data quality dimensions, quality ____, and quality indexes. ____, on the ____ of this framework, this paper constructs a dynamic assessment process for data quality. This ____ has good expansibility and adaptability and can meet the needs of big data quality assessment. The research results ____ the theoretical scope of big data and lay a solid foundation for the future by ____ an assessment model and studying evaluation algorithms.

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