Invited Contribution -- An Invitation to Knowledge Space Theory -- Historical Paper -- Implications and Dependencies between Attributes -- Regular Contributions -- The implication logic of (n,k)-extremal lattices -- Making use of empty intersections to improve the performance of CbO-type algorithms -- On the Usability of Probably Approximately Correct Implication Bases. -Formal Concept Analysis in a Logical Programming Setting for Visualization Oriented (Power) Graph Compression -- A Proposition for Sequence Mining Using Pattern Structures. -An investigation of user behavior in educational platforms using Temporal Concept Analysis. -Hierarchies of Weighted Closed Partially-Ordered Patterns for Enhancing Sequential Data Analysis -- First Notes on Maximum Entropy Entailment for Quantified Implications. - On overfitting of classifiers making a lattice -- Learning Thresholds in Formal Concept Analysis -- The Linear Algebra in Extended Formal Concept Analysis over Idempotent Semifields -- Distributed and Parallel Computation of the Canonical Direct Basis.