Additional work regarding the influence of significant others on occupational aspirations was subsequently done by Haller and is students Joseph Woelfel and Ed L. Fink.
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Later work initiated by Archie O. Haller and implemented by Joseph Woelfel and Edward L. Fink was able to survey adolescent students and identify the specific persons who communicated most with them about education and occupation, and who served as examples for their own educational and occupational futures.
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The logistics of this model are primarily attributed to William H. Sewell, as well as his colleagues Archibald Haller and Alejandro Portes.
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Unlike the previous research on this topic by Peter Blau and Otis Dudley Duncan, this model encompasses more than just educational and occupational factors and their effect on social mobility for American males.
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However, as theory surrounding social networks has developed, sociologists such as Alejandro Portes and the Wisconsin model of sociological research began placing increased leverage on the importance of these weak ties.