Explanation
The integration direction between the systems is one-way integration from the SIS to Salesforce for the IT department that is determining its integration needs between a Salesforce implementation, its SIS, and its housing system. One-way integration is a type of integration that allows data to flow in one direction from a source system to a destination system. The SIS is the source system and Salesforce is the destination system for the contact information and the housing mailing information of the students. The IT department should set up a one-way integration from the SIS to Salesforce to ensure that the data is consistent and accurate in both systems. One-way integration with Salesforce to the housing system, one-way integration with the housing system to Salesforce, or one-way integration with Salesforce to the SIS are not correct integration directions between the systems. References:
https://trailhead.salesforce.com/en/content/learn/modules/api_basics/api_basics_introduction
https://www.salesforce.org/wp-content/uploads/2019/03/Education_Cloud_COE_Guide.pdf