Problem: Post an explanation of language and cognitive development Then, explain how you could use this knowledge to advance social change within your profession, community, or society. Include in text citation from Callahan, D., Wilson, E., Birdsall, I., Estabrook-Fishinghawk, B., Carson, G., Ford, S., Ouzts, K., & Yob, I. (2012). Expanding our understanding of social change: A report from the definition task force of the HLC special emphasis project. Download Expanding our understanding of social change: A report from the definition task force of the HLC special emphasis project. Need Assignment Help?