I'd need of your help about the integration of ISO27001 and ISO20000 documentation. Our Company is already certify against ISO20000 standard and now we're working on the implementation of the ISMS based on ISO27001. The scope is the same for both the Management System. We'll integrate some documents, where possible. My question is whether we can put inside the ISO27001 documents, where appropriate, the references to the ISO 20000 ones or parts of the ISO 20000 documents, without create an integrated document.
Answer: Both ISO 20000 an ISO 27001 standards do not prescribe how to build the documentation, so you can elaborate your ISO 27001 documentation as you proposed (putting inside the ISO 27001 documents, where appropriate, the references to the ISO 20000 ones or parts of the ISO 20000 documents).
But before you do that you should consider if keeping separated documents wouldn't require more effort than using an integrated document (generally integrated documents are more useful and require less effort).