# User access management

In Emedgene, the [smallest unit of access control](/emedgene/emedgene-analyze-manual/settings/user_roles/iam-scopes-emedgene-roles.md) is an **Emedgene role** in legacy Emedgene environments and an **IAM scope** in Illumina environments. Each Emedgene role corresponds directly to an IAM scope, both defining the same set of access permissions.

In **Illumina environments**, user access is [managed externally](/emedgene/emedgene-analyze-manual/settings/user_roles/user-access-management-in-illumina-environments.md) through the AWS Identity and Access Management (IAM) service.

In **legacy Emedgene environments**, user access is [managed internally](/emedgene/emedgene-analyze-manual/settings/user_roles/user-access-management-in-legacy-emedgene-environments.md) via the User Management tab in Settings.


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