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Here we review the conclusions from the book chapters and outline some ideas for directions of future research. We discuss what we know and do not know about chondrule precursors, the chronology of chondrule formation, physical (temperature, dust/gas ratio, total pressure) and chemical conditions (fO2, partial pressure of Na, S, SiO, …) in chondrule-forming regions during chondrule formation, chondrule thermal histories, and chondrule formation models.