Multi review

At the moment, this is not possible. (I remember reading another issue with the same request, but I cannot findit again.)

We might try to setup a model how this should work, but don't expect it te be realized in the near future (Unles you provide patches yourself).

I can see the following model (which can actually work ATM):
-Set up a Workflow with (1) draft, (2) ready for review, (3) reviewed, (4) needs work and (5) published.
- Author makes a draft content (1)
- Editor sets the status to 'ready for review' (2) so the reviewers can see the content.
- Editor also sets a 'review before' date (Eg, sep 1st). The date can be
-- a Field,
-- or a scheduled transition to 'reviewed' per sep 1st.
- Reviewers can see content with status 'ready for review', 'reviewed' and 'needs work' (2, 3, 4).
- Reviewers may set content from (2) to (3) or (4) and from (3) to (4).
- For all content with status 'reviewed' and a date in the past, execute transition from (3) to (5)
-- Via views/vbo: select all content with status reviewed and dat in the past. Execute transition from (3) to (5)
-- via Editor: manually
-- via Rules
-- via the planned transition.

This may work for you. There are some flaws:
- only the first reviewer sees the status 'needs review'. The others already see 'needs work' or 'reviewed.'
-- a) you would need a per-user status,
-- b) or you would force the reviewers to only add 'scheduled transitions'
- the Workflow module does not support immediate transitions while a planned transition exists. (Technically it does, but not supported in UI)
- the Workflow module does not support multiple scheduled transitions per node. In the above scenario, you would have the following scheduled transitions:
-- from 'needs review' to 'reviewed' with comment at sep 1st by reviewer1
-- from 'needs review' to 'needs work' with comment at sep 1st by reviewer2
-- from 'needs review' to 'reviewed' with comment at sep 1st by reviewer3
-- from 'reviewed' to 'published' without comment at sep 2st by editor. (This should not be executed if a reviewer sets the status to 'needs work')

Crossposting: below issues both regard the situation "change immediate state, while having a scheduled transition":
#2097401: Multi review
#189572: Add ability to schedule a State change at node creation (not only when editing existing nodes)

See also this discussion on the Workflow Group: https://groups.drupal.org/node/6663

I've added this to a meta issue:
#2144747: [META] Flexible transitions

Closing this, but keeping as a sue case in the parent issue.