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		| Paper: | 
		Why Galaxies Care about AGB Stars: Setting the Stage | 
	 
	
		| Volume: | 
		497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time | 
	 
	
		| Page: | 
		1 | 
	 
	
		| Authors: | 
		Renzini, A. | 
	 
	
	
		| Abstract: | 
		In  this  introduction  to  the  Third  Congress  of  Vienna   on  asymptotic giant branch (AGB) stars, I first try to highlight why it is so hard  to cope with the AGB evolutionary phase. This phase is indeed  dominated by three main physical processes concerning bulk motions  of matter inside/around stars, namely envelope convection, mixing,  and mass loss. They are inextricably interlaced with each other in  a circular sequence of reactions and counter-reactions which has so  far undermined our attempts at calibrating such processes independent  of one another.  The second part of this introduction is focused on  globular clusters, illustrating how they came to be a new frontier  for AGB evolution and a new opportunity to understand it. | 
	 
	
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