Dr. Hartle's expertise as an analyst and his knowledge of public service, revenue and tax matters made him much in demand as a consultant. The records in this series begin with his contact with Canadian Cablesystems Ltd. In 1978, and there are files on a number of short-term contracts such as his review of the doctoral programme at Carleton University in 1990. The last file in this series relates to a study on public debt for the Economic Council of Canada (1991-1993).
Most of this series, however, is related to his work in Southern Africa. He served as a consultant to the Government of Botswana, officially from 1985, his first project being a trade agreement between Botswana and Zimbabwe that was concluded in 1986. He also undertook a number of short term contracts with the Government of Botswana, helped develop an industrial development policy for the country, provided advice in developing the tourist industry, and was an active participant in the Task Force on Local Government Finance (1992-1996). These activities led to Dr. Hartle being appointed Honourary Consul of Botswana in Toronto in 1989, an appointment he continued to hold until his death in September 1997.
Dr. Hartle's involvement in projects in Botswana also led, in 1988, to the creation of the Botswana/University of Toronto Project of which he was appointed director. The purpose of this Project was to "to provide the government of Botswana with a small number of economic consultants, having broad experience in their respective fields, to assist in the analysis of policy options open to the Government in pursuit of its development objectives [and to] provide U of T's students and faculty a unique opportunity to discuss developmental with high level Botswana government officials." One consequence was the admission of students from Botswana into the graduate program in economics at the University of Toronto and a comparative study of the relationship between governments and post-secondary institutions. Dr. Hartle sought financing from a variety of sources, including the World Bank.