  Argumentation provides a representation of arguments and attacks between
these arguments. Argumentation can be used to represent a reasoning process
over evidence to reach conclusions. Within such a reasoning process,
understanding the value of information can improve the quality of decision
making based on the output of the reasoning process. The value of an item of
information is inherently dependent on the available evidence and the question
being answered by the reasoning. In this paper we introduce a value of
information on argument frameworks to identify the most valuable arguments
within the finite set of arguments in the framework, and the arguments and
attacks which could be added to change the output of an evaluation. We
demonstrate the value of information within an argument framework representing
an intelligence analysis in the maritime domain. Understanding the value of
information in an intelligence analysis will allow analysts to balance the
value against the costs and risks of collection, to effectively request further
collection of intelligence to increase the confidence in the analysis of
hypotheses.
