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Abstract.The founder of symbolic temporal logic, A. N. Prior was to a great extent motivated by philosophical concerns. The philosophical problem with which he was most concerned was determinism versus free will. The aim of this paper is to point out some crucial interrelations between this philosophical problem and temporal logic. First, we sketch how Prior's personal reasons for studying the problems related to determinism were philosophical -initially, indeed theological. Second, we discuss his reconstruction of the classical Master Argument, which has since Antiquity been considered a strong argument for determinism. Furthermore, the treatment of determinism in two of Prior's proposed temporal systems, namely the Ockhamistic and the Peircean systems, is investigated. Third, we illustrate the fundamental role of the very same issue in more recent discussions of some tempo-modal systems: The 'Leibniz-system' based on ideas of Nishimura (1979) as well as Belnap and Green's argument (! 1994), to which we add some necessary revisions.

The surveillance in public and private places, both physically and digitally, is increasing for different reasons. In this paper we intend to discuss surveillance and persuasive technology in an ethical perspective with an eye to its historical and cultural context. In section 1, we present some different tendencies of surveillance in society. In section 2, we elaborate on some important historical ideas on surveillance. In section 3, we consider the use of persuasive technology for surveillance purposes. In section 4, we discuss the development towards increasing surveillance in society, at work, in public places etc. In section 5, we draw up some ethical concerns on surveillance, and finally. In section 6, we discuss the question of a possible need for a public and democratic control of the use of surveillance technology.

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Persuasive design (PD) is concerned with the use of computing technology for persuasive purposes. It thereby captures a comprehensive and important trend in CMC, human-computer interaction, and software development in general. This chapter describes the basic concepts of PD as well as its development from its inception in the late 90s until now. So far, rhetoric has played a modest role in the field. However, it is shown that rhetoric offers a major step forward in consolidating PD as a discipline. The concepts of PD in many respects have a theoretical basis in and are better understood with reference to rhetoric; a number of practical guidelines for PD can and should be developed on the basis of rhetoric; and ‘epistemic rhetoric’ offers a sound epistemology for PD, which is at the moment lacking. Arguably, a rhetorical turn is required for coming to grips with the problem of defining PD and placing it properly as a special case of CMC, namely computer mediated persuasion.

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