[22] Interview with Peggy Cole，Director，Special Projects，at New-York Hall of Science，1.11.91；‘The science teacher career ladder’ leaflet，New York：New York Hall of Science，1991.
[23] Interview with Paul Fontaine，Manager of Public Programs，Museum of Science，Boston，28.10.91.
[24] S.McCormick，op.cit.，pp.7-10.
[25] Interview with Paul Fontaine，op.cit.
[26] Interview with Paul Richards，Vice-President，Exhibitions at The Children’s Museum of Indianapolis，3.11.91；The Children’s Museum，1990 Annual Report，Indianapolis：The Children’s Museum，1991，p.11.