Final answer:
Lisa used her own cultural context and previous experiences to assume that Thanksgiving would be celebrated on a Thursday, as is traditional in the United States.
Step-by-step explanation:
Lisa's colleague suggested their office celebrate Canadian Thanksgiving, which falls on the second Monday in October, as opposed to the traditional U.S. Thanksgiving celebrated on the fourth Thursday in November. The developmental process that Lisa utilized when she assumed her office was celebrating Thanksgiving on Thursday reflects her reliance on her own cultural context and previous experiences. As a U.S. native, her experiences with Thanksgiving have always involved a Thursday celebration, so without the correct day of the week explicitly mentioned, she defaulted to this familiar pattern.