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+===============================================
+Explicitly specify existing users for scenarios
+===============================================
+
+
+Use Case
+--------
+
+Rally allows to reuse existing users for scenario runs. And we should be able
+to use only specified set of existing users for specific scenarios.
+
+
+Problem Description
+-------------------
+
+For the moment if used `deployment` with existing users then Rally chooses
+user for each scenario run randomly. But there are cases when we may want
+to use one scenario with one user and another with different one specific user.
+Main reason for it is in different set of resources that each user has and
+those resources may be required for scenarios. Without this feature Rally user
+is forced to make all existing users similar and have all required resources
+set up for all scenarios he uses. But it is redundant.
+
+
+Possible solution
+-----------------
+
+* Make it possible to use explicitly existing_users context