[en] Results of recent experiments on DIII-D ohmic and neutral beam injection heated plasmas which provide further evidence of the role of the edge plasma on stability and confinement of the core plasma are presented. The presentation is organized into three independent sections. The first section describes the results of detailed thermography on the divertor tiles during plasma heating. Section 2 presents results of detailed electron temperature and density profile measurements. The last section is devoted to a discussion of radiation and power balance. 15 refs., 42 figs