How are lead assignment rules executed in Salesforce?

Dear all on this post,

Often overlooked is the need to create a "catchall" step after activating an assignment rule (either Lead or Case) meant to address records that may escape the criteria mentioned in your rules. If not, the default Lead or Case Owner (both in Setup) will be assigned. This Default Owner often ends up being the first user created on the org.

Just a handy insight from previous experience.

Hi Anjali,

Now you should be able to understand that how lead assignment rules work in Salesforce.

Let us understand that when lead assignment rules get executed in Salesforce :

1. The original record is loaded from the database (or initialized for an insert statement)
   2. The new record field values are loaded from the request and overwrite the old values
   3. All before triggers execute (TRIGGERS)
   4. System validation occurs, such as verifying that all required fields have a non-null value, and running any user-defined validation rules (VALIDATIONS)
   5. The record is saved to the database, but not yet committed
   6. All after triggers execute
   7. Assignment rules execute
   8. Auto-response rules execute
   9. Workflow rules execute (WORKFLOW)
   10. If there are workflow field updates, the record is updated again
   11. If the record was updated with workflow field updates, before and after triggers fire one more time (and only one more time)
   12. Escalation rules execute
   13. All DML operations are committed to the database
   14. Post-commit logic executes, such as sending email

Thanks

A Lead assignment rule consists of multiple rule entries that define the conditions and order for assigning cases. From a Salesforce User interface, a user can trigger assignment rules by simply checking the Assign using active assignment rules checkbox under the optional section.