This book constitutes the refereed proceedings of the 4th International Workshop on the Theory
and Applications of Formal Argumentation TAFA 2017 held in Melbourne VIC Australia in
August 2017. The workshop was co-located with International Joint Conference on Artifi cial
Intelligence(IJCAI 2017). The 15 revised full papers presented were carefully reviewed and
selected from 20 submissions. The workshops covers the subjects such as non-monotonic reasoning
decision making inter-agent communication the semantic web grid applications ontologies
recommender systems machine learning neural networks trust computing normative systems
social choice theory judgement aggregation and game theory and law and medicine.
