In Assignment Rule Entries in Salesforce, if the first rule is satisfied, rest of the rules will be checked.Consider the below example

Rule 1:
If Case Reason contains ‘Other’ and Case Description is equal to ‘Issue’, then the case should be assigned to Magulan Pandian.

Rule 2: 

If Case Reason is equal to ‘Other’, then case should be assigned to Test.

Rule 3:

If Case Description is equal to ‘Issue’, then case should be assigned to Test.

If Rule 1 is satisfied, Rule 2 and Rule 3 will not be executed. So, be careful in Rule Entries order of execution.

Sample Output:

It has been assigned to Magulan Pandian, because Rule 1 is satisfied, other Rules 2 and 3 are not executed.