Word of caution here Nick. Be very careful when choosing to use some of the default roles without first having a good look through what permissions they have by default. As an example, the Quality Administrator role actually has Architect flow permissions, including the ability to Edit those flows. It's very likely that's undesirable. You're also better looking at the actual role permissions and not necessarily what the resource centre says - which is not always accurate.
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Vaun McCarthy
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