Analyzing an existing role in SAP

Hi Security gurus

I am novice in security and been asked to analyze an existing role in SAP, this role is given as a customized default role to every user master created. Now, I am not sure about understanding dependency as why certain auth.objects are given the values they have. Or interdependency among the auth. objects themselves.

How do I know what is the problem when a T-code is deleted from a role?

Help me or at least point me to a direction where I can read about this.

Thanks