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Mathematical excursions should contribute to , rather than detract from , the flow of the report . A variety of disease and medical problems may contribute to each of the four major types of incontinence . The activation of the temporary movement of natural persons would contribute to economic vitalization in both developed and developing countries and this would be linked to global economic development over the long-term . Nevertheless , an evaluation of procedures and reinforcement of sound ones would contribute to a reduction of conflict . Closer cooperation between environmental NGOs might contribute to a more complete and coherent analysis of the environmental problem ( s ) ; a fact that plays a role in supporting all kinds of cooperation , national or cross-national .