# Lead Source for Manually Created Leads/Contacts

We want to make manually creating Leads and Contacts as easy as possible. For this reason, we don’t ask them to fill out detailed Attribution information via the [‘Processing’ fields](/key-concepts/processing-raw-and-reporting-fields.md), as we do for automated processes like [web forms ](/how-to-guides/web-form-attribution.md)and [list uploads](/how-to-guides/list-upload-attribution.md). Instead, we ask that they set a value in Lead Source. The system will automatically use the value in ‘Lead Source’ for the attribution of Engagements generated from a Lead or Contact creation if the ‘Processing’ fields are blank.

Thus, we recommend that the ‘ **Lead Source** ’ field has as few meaningful values as possible, that all teams are aligned on their definitions, and that it is required, at least for manually created Leads and Contacts.

**Example values:**

* Sales - List Import
* Sales - Outside Sales
* Sales - Inside Sales
* Sales - Tradeshow/Event
* Sales - Referral
* Marketing - Inbound Call/Email
* Marketing - List Import
* Marketing - Paid Media List Import
* Marketing - Tradeshow/Event
* Marketing - Website
* Channel - Deal Registration
* Other/Unknown

See the related[ **Attribution Logic for Lead/Contact Creation** ](/key-concepts/attribution-logic-for-lead-contact-creation.md)article.


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