This ('Argumentation-Based Negotiation in a Social Context', Nishan C. Karunatillake, 2006) is the third thesis I have gone through now. I really liked, and read fully, the first three chapters. Quite a few question marks penned when going through the protocol and operational semantics in Chapter 3 - questions regarding the method of arguing (challenging and asserting). Apparantly these questions are addressed in a later journal paper and technical report, which I will go through now. It is worth noting that the negotiation/argumentation strategies defined in later chapters are far (in my opinion) from using the full capacity of the framework defined in Chapter 3.
I really liked the scenario presented in Chapter 4.1. Very good - lots of scope for play/conflicts/etc. Though however, the system model following this in Chapter 4.2 becomes very mathematics/number-based. The "argue" method doesn't really argue. It is quite similar to my "argmas09" paper - the responding agent provides a reason for rejection which the proposing agent incorporates into its knowledge-base for future proposals.
The strategies defined in Chapter 5.1 for the experimentation (empirical analysis) I thought were rather random - seems to be no justification at all for these strategies over any other. I couldn't quite see the general applicability of the results presented in Chapter 5.3 beyond the specific application setting of this paper. I skipped/glossed over to the summary.
Chapter 6 proceeds by simplifying the experimental scenario defined in Chapter 4.1 for the argumentation strategies to be defined in this chapter. Really not clear what the defeat-status computation (to determine the validity of a claim/premise) used in these strategies is. Also, I couldn't quite work out how the argumentation was done in the strategies - not clear what is being challenged/asserted. This chapter could have done with some examples.