【Paper】
Modeling of the Collection System of Waste Paper based on Questionnaire Survey
Akio Shimizu*, Toshiya Aramaki** and Keisuke Hanaki***
* Department of Advanced Interdisciplinary Studies, School of Engineering, The University of Tokyo
Present address: Research Center for Life Cycle Assessment, National Institute of Advanced Industrial Science and Technology
** Research Center for Advanced Science and Technology, The University of Tokyo
*** Department of Urban Engineering, The University of Tokyo
† Correspondence should be addressed to Akio Shimizu:
Research Center for Life Cycle Assessment, National Institute of Advanced Industrial Science and Technology
（16-1 Onogawa Tsukuba Ibaraki, 305-8569 Japan）

Abstract
In order to manage the complicated waste paper collection and wholesale system, the activities of companies in this field were analyzed and modeled using Quantification Theory III, which converts qualitative information into quantitative parameters.
Characteristics of each company were categorized based on a questionnaire that focused on waste paper collection activities. A work-flow model of the collection system was then developed.
Companies were grouped into three kinds of collectors and wholesalers.
It was found that the different systems for material flow of waste papers are different depending on their sources.

Key words: waste paper, collection and wholesale business, quantification theory �V, structural model, questionnaire survey