Keep it simple
The design work should focus on a straightforward solution. Multiple levels of approval, crosschecks and complexity can be added after the go live date if determined to be truly necessary. The common regret heard from Workday references is that the institution made the system too complex; it is easier to add more complexity later, but harder to simplify. The Japanese concept of poka-yoke should prevail, i.e. “All else equal, a simple and elegant solution is better than a complex one”.