The preceding editions of the FCA4AI Workshop (ECAI 2016, 2014 and 2012, IJCAI 2015 and 2013) showed that many researchers working in Artificial Intelligence are indeed interested by a powerful method for classification and mining such as Formal Concept Analysis (see CEUR Proceedings Vol-1703, Vol-1430, Vol-1257, Vol-1058, and Vol-939). 

This year, we have the chance to organize a new edition of the workshop in Stockholm at the IJCAI 2018Conference. 

Formal Concept Analysis (FCA) is a mathematically well-founded theory aimed at data analysis and classification. FCA allows one to build a concept lattice and a system of dependencies (implications) which can be used for many AI needs, e.g. knowledge processing involving learning, knowledge discovery, knowledge representation and reasoning, ontology engineering, and as well as information retrieval and text processing. Thus, there exist many "natural links" between FCA and AI. 

Recent years have been witnessing increased scientific activity around FCA, in particular a strand of work emerged that is aimed at extending the possibilities of FCA w.r.t. knowledge processing, such as work on pattern structures and relational context analysis. These extensions are aimed at allowing FCA to deal with more complex than just binary data, both from the data analysis and knowledge discovery point of view and from the knowledge representation point of view, including, e.g., ontology engineering. All these works extend the capabilities of FCA and offer new possibilities for AI activities in the framework of FCA. 

Accordingly, in this workshop, we will be interested in two main issues: 

• How can FCA support AI activities such as knowledge processing (knowledge discovery, knowledge representation and reasoning), learning (clustering, pattern and data mining), natural language processing, information retrieval. 
• How can FCA be extended in order to help AI researchers to solve new and complex problems in their domain. 

The workshop is dedicated to discuss such issues.