This is the first part of an interview that Ingrid Robeyns conducted with Amartya Sen in May 2010 at Trinity College, Cambridge. It engages with Sen's views on key socio-economic notions such as the quality of life, well-being, GDP, and the issues related to measuring them. A 23-minutes compilation of this material was screened at a conference on the Quality of Life in The Hague, on June 8, 2010, and is to be found elsewhere on RUclips.