Un ejemplo de los diagramas de venn.

Tomado de:

https://www.google.com.co/search?q=pasos+para+hacer+u+n+diagrama+de+venn&es_sm=93&noj=1&tbm=isch&tbo=u&source=univ&sa=X&ei=iHffU5D1BJDMsQTkv4KoCg&ved=0CFEQsAQ&biw=1366&bih=667#facrc=_&imgdii=_&imgrc=MvildAmEthQpHM%253A%3BnakTFpTGWLlDwM%3Bhttp%253A%252F%252Fwww.eduteka.org%252Fimgbd%252F22%252F22-10%252FDiagramaVennGran.gif%3Bhttp%253A%252F%252Fwww.eduteka.org%252Fmodulos.php%253Fcatx%253D4%2526idSubX%253D109%2526ida%253D718%2526art%253D1%3B800%3B787