This text deals with the cognitive structure of arguments. A formal system of analysis is proposed that reflects the reasoning processes leading to an argument. It is argued that behavioural studies of argumentation can be fruitfully conducted on the basis of this system. Topics include: reasoning and arguing; the nature of formalizations; operators, targets, outcomes; compounds; the nature of justification; outcomes of conflations and conflations as targets; and relations within and between arguments. --This text refers to an out of print or unavailable edition of this title.