What type of questioning invigorates and sustains productive discussions? That's what Jackine Acree Walsh and Beth Dankert Sattes ask as they begin a passionate exploration of questioning as the beating heart of thoughtful discussions. They present and analyze the DNA of productive discussions--teacher-guided, small-group, and student-driven. Contents: Quality questioning: the heart of thoughtful discussion -- The DNA of productive discussion: social, cognitive, and use-of-knowledge skills and companion dispositions -- Teacher-guided discussion: teachers as coaches during five stages of discussion -- Structured small-group discussion: using protocols to scaffold skills for discussion -- Student-driven discussion: putting students in the driver's seat -- Questioning for discussion: creating your own designs.