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Although there already exist many uncertainty measures for intuitionistic fuzzy sets, few of them can discriminate uncertainty degrees of crisp sets. In order to construct a unified uncertainty measure for intuitionistic fuzzy sets, non-specificity must be taken into account. Starting from the Hartley measure, which is related to the cardinality of a crisp set, we propose a non-specificity measure for intuitionistic fuzzy sets. Properties of the proposed non-specificity measure are also investigated. Illustrative examples are employed to show its performance.<\/jats:p>","DOI":"10.3233\/ifs-151685","type":"journal-article","created":{"date-parts":[[2015,11,10]],"date-time":"2015-11-10T16:36:44Z","timestamp":1447173404000},"page":"2087-2097","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":5,"title":["How to measure non-specificity of intuitionistic fuzzy sets"],"prefix":"10.1177","volume":"29","author":[{"given":"Yafei","family":"Song","sequence":"first","affiliation":[{"name":"Air and Missile Defense College, Air Force Engineering University, Xi\u2019an, PR China"}]},{"given":"Xiaodan","family":"Wang","sequence":"additional","affiliation":[{"name":"Air and Missile Defense College, Air Force Engineering University, Xi\u2019an, PR China"}]},{"given":"Xiaodong","family":"Yu","sequence":"additional","affiliation":[{"name":"Air and Missile Defense College, Air Force Engineering University, Xi\u2019an, PR 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