HANA Security - Best Practices for Schema??

Hi,

Currently we don'y have a defined Security model in HANA Studio.Neither there is no defined duties of a BASIS / Security / Developers.

I want to understand what best practices are followed at other customers for defining security for Schema.

1. Who should be creating the schema for Developers / Modelers?

2. Should we use our own ID's to create/maintain these Schema or a Generic ID?

Right now, when developers log in to Studio, by default they are assigned to their own schema (User ID) and they create objects under that.

We(Security team), face issues when other developers need access to schema of another user as they want to develop objects under schema of different user

Also, who should be owning the "SYSTEM" user ID and what steps needs to be done whenever a new schema is created.

Thanks for the help in advance.