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Host groups are what permissions are based on for user groups.
Recommended to use
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Hostgroup names that
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includes the group of the owner.
Examples:
Group Name: Middleware Development & Integration - MDI
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Recommended to use template names that makes it easy to recognize it's function and include the group name of the owner.
Hosts
Object to be monitored (servers, switches, routers, etc)
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Recommended to use host group names that are easy to recognize identify the owning user group who owns it. Prepend user group or something similar.
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Make sure your actions only affect the host group you are working with and the user/user group you are targeting.
Recommended to use Hostgroup names that specify the owning group. (e.g. EA - Hosts)