The objective of the present paper is to provide food for thought for the debate on domestic support in analysing the main controversies around ten methodological issues of opposite concepts: agricultural supports vs agricultural subsidies; administered prices vs market prices; coupled subsidies vs decoupled subsidies; domestic subsidies vs export subsidies; subsidies to agricultural products vs subsidies to agricultural inputs; export subsidies to raw products vs to processed products; green box subsidies vs gold box subsidies; domestic agricultural subsidies vs import protection; commercial dumping vs monetary, fiscal, social and environnemental dumping; subsidies to developed countries vs subsidies to emerging countries.