The marketing qualified lead (MQL) versus sales qualified lead (SQL) debate has raged in B2B companies for decades. Marketing says leads are qualified. Sales says they're not. The result is finger-pointing, misaligned expectations, and revenue left on the table. Understanding and aligning on lead definitions is foundational to revenue growth.
What Is a Marketing Qualified Lead (MQL)?
An MQL is a lead that meets marketing's qualification criteria: fits the ideal customer profile, has engaged with your content, and has demonstrated sufficient interest to warrant sales follow-up. MQLs are typically scored based on demographic fit and behavioral engagement.
The key characteristic of MQLs is marketing-readiness. They've engaged enough to indicate interest but may not be ready for direct sales conversation. MQLs benefit from continued nurturing before sales contact.
What Is a Sales Qualified Lead (SQL)?
An SQL is a lead that sales has determined is worthy of active pursuit: they've confirmed the lead fits their customer profile, has a genuine business problem your solution addresses, and has the authority and urgency to make a purchasing decision.
The key characteristic of SQLs is sales-readiness. They're prepared for discovery calls, demos, and pricing discussions. These leads convert to opportunities at significantly higher rates than MQLs.
The Definition Gap
The MQL vs SQL problem typically emerges from misaligned definitions. Marketing's definition of "qualified" is often broader than sales' definition. Marketing measures success on lead volume while sales measures success on conversion rates. This misalignment creates friction where sales feels marketing sends unqualified leads while marketing feels sales doesn't follow up on the leads they work hard to generate.
Closing the Gap
Joint Definition Workshop
Bring marketing and sales together to agree on lead definitions. Use historical data to validate criteria: which lead characteristics actually predict close? Build definitions based on evidence, not assumptions.
Service Level Agreements
Once definitions are aligned, create explicit SLAs: how quickly will sales follow up on SQLs? What minimum engagement threshold qualifies a lead for sales follow-up? Clear expectations prevent finger-pointing.
Closed-Loop Feedback
Sales must report back to marketing on lead quality. When leads convert to customers, marketing learns what works. When leads stall, marketing learns what needs improvement. This feedback loop enables continuous optimization of lead definitions and scoring.