The study investigates whether input and interaction features which previous research has identified as characteristic of native speaker (NS) - nonnative speaker (NNS) speech (features which occur more frequently in NS-NNS speech than in speech between NSs) will occur with equal frequency in NS-NNS speech settings in which the NNSs have considerable proficiency and enjoy peer status with the NS participants. Sixteen undergraduate students participated and were taped in NS-NNS dyads. The variables reported on are (1) present-nonpresent temporal marking of verbs, (2) ratio of topic-continuing to topic-nominating moves, (3) percentage of topic-nominating moves in question form, and (4) percentage of question types used in topic-nominations. The results confirm earlier claims of discourse features characteristic of NS-NNS interaction. These features, which reflect NS strategies designed to avoid conversational trouble, include the relatively great use of present-tense-oriented topics, of questions as a device for making topics salient, and of topics typically treated more briefly. Results also indicate that the frequency of discourse modifications by NSs in conversation with NNSs is variable and attributable to both the proficiency of the NNS participant and the shared knowledge that the subjects bring to the conversation. (Author/JK)