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The working method was that, reviewing the literature and previous information behaviour models, such as Wilson, Ellis, Kuhlthau, and Dervin models, this article proposes a novel model of information-seeking behaviour for library users. Our model of information-seeking behaviour was developed by combining the existing models of planned information-seeking behaviour with the focus on the factors affecting unplanned rather than planned behaviour of users in accessing resources or services. Our proposed model for information-seeking behaviour of clients has two main parts. The first part planned behaviour resulting from a problem or a certain information need according to which the user seeks to find information in a planned manner. The second part deals with unplanned behaviour shaped by a hidden or uncertain information need. Finally, both types of behaviour can result in the discovery, extraction, collection and use of information.<\/jats:p>","DOI":"10.1177\/01655515231196390","type":"journal-article","created":{"date-parts":[[2023,9,11]],"date-time":"2023-09-11T03:03:20Z","timestamp":1694401400000},"page":"529-538","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":3,"title":["A model of planned and unplanned information-seeking behaviour"],"prefix":"10.1177","volume":"52","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8505-4996","authenticated-orcid":false,"given":"Hadi","family":"Harati","sequence":"first","affiliation":[{"name":"Knowledge and Information Science, Information Center and Central Library, Ferdowsi University of Mashhad, Iran"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alireza","family":"Isfandyari-Moghaddam","sequence":"additional","affiliation":[{"name":"Department of Knowledge and Information Science, Islamic Azad University, Hamedan Branch, Iran"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2023,9,11]]},"reference":[{"key":"e_1_3_3_2_2","unstructured":"Ajzen I. 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