Vendor Responding via SIG Questionnaire

Hi,

Is there any detailed documentation/blogs/posts around the Standardized Information Gathering (SIG) Questionnaire Integration and how an organization can leverage this functionality.

Background - We have our own assessment's, that leverage the subset of SIG Core/Lite Questionnaire depending on the domains, that we ask vendors to take. In a lot of scenario's vendor provide their own SIG instead of taking the assessment resulting in manual review's, etc outside of SNOW. 

We want to streamline the process and move away from scenarios where we have to do assessments outside of SNOW. Detailed documentation would be a lot of help!