Professor Walløe's research interests cover an unusually wide range of fields. His expertise in one field frequently enriches research in another and stimulates cross-fertilisation between disciplines. Demography is one of many different subjects that have benefited from his insights.
In 1972-1974, he carried out an interview-based survey on family planning together with a group of medical students. In 1981, he was appointed chair of a government-appointed committee that was asked to draw up a report on the possible consequences of the decline in the birth rate in Norway during the 1970s. The committee's conclusions were published as Official Norwegian Report 1984:26.
Professor Walløe's interest in demography, combined with a keen interest in history, resulted in a study of the population decline in Norway in the late Middle Ages after the Black Death. He published new views on the plague and the way it is transmitted and developed models for simulation of population growth during this period, thus providing valuable input to the scientific debate on the plague.
Professor Walløe has played an active and important role in methodological development in historical demography by making use of his qualifications in medicine, informatics and statistics. He made invaluable contributions to a project on the decline in fertility in Norway in the period 1890-1930 under the auspices of the Norwegian Research Council for Science and the Humanities.
Professor Sølvi B. Sogner,