It showcases this concept within Agile Ceremonies:
It also points out that when teams are working at an unsustainable pace, they often remove their opportunities to be reflective and minimize their opportunities to improve.
While the concepts in the article should not be new to experienced agile practitioners, the Reflective Agile Learning Model (REALM) is worth looking into more. I am also encouraged that studies like this are being done.
Read more at:
http://computingnow.computer.org/cms/Computer.org/ComputingNow/issues/2014/07//mso2014040051.pdf
