Final answer:
It is best for HR to collaborate with other departments to build an HRIS in-house when the organization has unique business needs and the functional and technical skills in-house.
Step-by-step explanation:
The best time for HR to collaborate with other departments to build an HRIS in-house is when the organization has unique business needs and has the functional and technical skills in-house. In this case, a customized solution can be developed that perfectly aligns with the organization's requirements.
Additionally, if there is a need for a robust customized solution that cannot be met by off-the-shelf systems, collaborating with other departments can bring together the expertise and resources needed to create an effective HRIS.