My CSDM model

[OzlemD]

Hello,
I'm new to ServiceNow.

I am trying to model the CSDM based on our UseCases. I would like to know how to model the CSDM for cases where there are links between Service Applications? I have tried to model it as follows:

Or as below:

what do you think? If not, how do you go about it?

Thanks.

[Christian Kaise]

I dont understand the intention of the upper picture fully. The 2nd sketch looks better

To answer your question in more detail you need to consider the use cases of your main service instance and try to estimate what happens.

If e.g you need another service instance to keep your main service instance useable for business I would suggest to use a depends on :: used by relationship. So your 2nd service instance would move more below the other one. 
if you only want to visualize a data connection I am often using sends :: receives data.

if you open the service instance creation dialog you are also able at step one in the slashbucket section to add parent service instances to the one you are creating. As far as I know, the selection there creates a depends on :: used by relationship.

A technical diagram of csdm 5.0 will be released very soon as I heared on the knowledge from marc bordmann

[TheJoeDC]

If you look at the definition of a Service Instance is a logical layer rather than physical. In the 2nd picture you might have different instances based on location (say "US ERP" versus "APAC ERP" due to governance, each running on different CI's). The users might simply know it as Planning App.