What are the impediments to achieving collective action in group politics

Collective action refers to action taken together by a group of people whose goal is to enhance their status and achieve a common objective. It is a term that has formulations and theories in many areas of the social sciences including psychology, sociology, anthropology, political science and economics.

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.

i believe that the answer to the question provided above is that the role of campaign committees is to act as a bridge between state and local campaigns.