Boston Pizza is Canada's number one casual dining brand. The Boston Pizza brand has served communities from coast-to-coast for over 56 years since opening its first restaurant in Edmonton, Alberta in 1964. Today Boston Pizza proudly remains a Canadian company with its hundreds of local franchise owners operating more dining rooms, sports bars and patios than any other single brand in the country, along with take-out and delivery. BPI has been recognized as a Platinum Member of Canada's 50 Best Managed Companies and has been a Franchisees' Choice Designation winner for eight consecutive years.

Make an elaborated external environment analysis for Boston pizza using proper citations.