Analysis Service supports role based model to secure cube data. Data can be secured at object level, cell level (Cell Data Access) and at member level (Dimension Data Access). There are relative merits of each approach, which isn’t the topic of this post but more details can be found here. A user can be a member of more than one role and it is important to understand the behaviour of Analysis Services role permissions in such a scenario. Analysis Services role permissions are additive in nature. This means if you are a member of a role that has been granted access to an Analysis Service object; you have access to that object even if you belong to another role which denies access to the same object. In other word the least restrictive roles permissions override the most restrictive role permissions. This could throw some nasty surprises that you never expected.  

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