International Journal of Neutrosophic Science IJNS 2690-6805 2692-6148 10.54216/IJNS https://www.americaspg.com/journals/show/522 2020 2020 Department of Mathematics and Computer Science, Faculty of Sciences, Port Said University Egypt A. A. Salama Department of Mathematics and Computer Science, Faculty of Sciences, Port Said University Egypt M.S.Bondok Henawy Department of Mathematical Statistics, Faculty of Science, Albaath University, Homs, Syria Rafif Alhabib  In this paper, a neutrosophic fuzzy data warehouse modelling approach is presented to support the neutrosophic analysis of the publishing house for books which allows integration of neutrosophic concept in dimensions and facts without affecting the core of a crisp data warehouse. Also we describe a method is presented which includes guidelines that can be used to convert a crisp data warehouse into a neutrosophic fuzzy domain. Finally we have presented an OLAP system that implements a neutrosophic multidimensional model to represent imprecision using neutrosophic concept in hierarchies and facts and achieving knowledge discovery from imperfect data. The use of neutrosophic structures and the definition of the OLAP operations (roll-up, drill-down, slice, and dice) enable the model to manage the imprecision of data and hide the complexity of the model and provide the user with a more understandable result. 2020 2020 87 109 10.54216/IJNS.080203 https://www.americaspg.com/articleinfo/21/show/522