In the view of an item you can see the decision taken on it, see this screenshot:
This consist of multiple parts to help you know more about the decision:
The agent who took the decision. If the decision was taken by rules it will write out "automatically".
The time the decision on the item was taken.
Refusal Reason (If any)
For refused items this shows the reason for the refusal (when using rules there can be multiple).
Time to decision
A calculation of the time from your system sending in the content to Implio until a decision has been taken, either via automation or manually.