Historically, the spelling of program was used in every kind of dialect, and had no difference from the spelling programme. The interchangeable nature of these spellings was due to the lack of standardization compared to today. As such, when the spelling of words became standardized, people started using each word to refer to different things and gave rise to the American-centric and British-centric spellings. Learn about the key differences between program and programme at the College of Contract Management.