From an article on working together within neighborhoods:
"I define neighbourhoods ecologically and highlight variations in the working trust and shared willingness of residents to intervene in achieving social control. The concept of neighbourhood collective efficacy captures the link between cohesion – especially working trust – and shared expectations for action. Just as self-efficacy is situated rather than general (one has self-efficacy relative to a particular task), a neighbourhood’s efficacy exists relative to specific tasks such as maintaining public order. The key causal mechanism in collective efficacy theory is social
control enacted under conditions of social trust."
Robert Sampson, Harvard University
http://www.wjh.harvard.edu/soc/faculty/sampson/articles/2004_NewEc.pdf