This chapter by Törnblom and Kazemi discusses a number of issues in SRT which seem to benefit from further developments. Specifically, they ask whether the Foas’ resource classification meets the criteria for a typology, whether there are other dimensions than concreteness and particularism and whether the Foas’ six resource classes can be categorized into subclasses. Törnblom and Kazemi further discuss the validity of some of the exchange rules that the Foas formulated. They also extend the Foas’ two basic behavioral modes of giving and taking into four basic modes of exchange (i.e., giving-giving, giving-requesting, requesting-giving, and requesting-requesting), and this opens up for a host of further distinctions when additional facets like resource valence and resource type are included. Additional issues discussed in this chapter involve the production and acquisition of resources, different types of linkages between the production, acquisition, possession, and provision of resources, and finally the relevance of SRT to the topics of social justice, social exclusion, well-being, social dilemmas, social comparisons, and volunteering. Some of these issues are the focus of several chapters in this handbook.