Per-diem (day-rate) usually refers to what someone's pay rate is based on,i.e. per the day, job, etc. Many nurese work per-diem where they have no set hours but are paid an hourly rate as the are sent on temporary assignments-such as home health nurses.
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The process makes it easy for anyone, including new employees, to see what the task is and how to complete it. The social media process will delegate certain responsibilities. For example, a blog post may have a writer, a designer (for graphics) and a manager to share the post on social profiles.