The research literature on quality is complex. If I was trying to summarize it in a way that is short and brief, the key element of quality is the educational preparation and the working conditions of the early childhood educator who's working with children in the room.
When we look at the research, that's what we come back to. What is the nature of the qualification for that educator, and how is she prepared and supported in her important role? I would anticipate, in the bilateral agreements, particular attention would be paid to ensuring that early childhood educators are properly paid, fairly compensated and educationally prepared for their work.
The central element to quality is the educator and her interactions with children.