Ask marketing and sales in most B2B companies what an MQL is, and you'll get two different answers. That disagreement is expensive. Leads fall between teams, high-value prospects wait days for a response, and nobody can say with confidence how well the funnel is working.
In this third part of our lifecycle series, we'll define each B2B funnel stage, set out a marketing-to-sales handoff that works, and explain why product-led trial signups belong in the funnel too.
Two ways into the pipeline
Business customers usually arrive in one of two ways:
- Sales-led: demo requests, contact forms, gated content, events and abandoned business checkouts. These contacts enter a lead nurture programme that educates them with product information, case studies and guides.
- Product-led: businesses that sign up directly with "Buy now" or a free trial. They enter product onboarding straight away.
The key principle is that product-led trialists are still leads. They should be scored throughout their trial, just like a demo request, so sales can step in when a high-value account is evaluating the product. Treat the trial period as a sales qualification window, not just an onboarding sequence.
Define every funnel stage
Each stage needs clear entry criteria and a clear owner. Contact records should update automatically as people move through, so everyone can see each contact's current stage at any time.
- Form, trial or abandoned checkout. Nurture and scoring begin.
- Fit and engagement scores pass the threshold. SLA starts.
- Sales confirms fit, need and timing.
- Active deal with need, budget and timeline.
- Paid subscription. Customer lifecycle begins.
Write these definitions down and get both teams to sign them off. It sounds bureaucratic, but it's the foundation for every report, every automation and every conversation about lead quality.
The marketing-to-sales handoff
A good handoff makes sure the best contacts are prioritised and nothing gets lost. Here's a process that works:
- New contact: stage set to Lead. They receive lead nurture and are scored on fit and engagement.
- Threshold reached: when their score passes the MQL threshold, the stage updates to MQL automatically.
- Assignment: a sales rep is assigned and notified, and the SLA begins, for example a response within one working day.
- Review: the rep assesses the MQL and either:
- accepts it, updating the stage to SQL and starting the sales process; or
- rejects it with a reason, returning the contact to Lead.
- Escalation: if no action is taken within the SLA, the lead is escalated automatically so it's never left waiting.
- Conversion: accepted leads become opportunities, and opportunities become customers.
Lead Nurture and scoring Threshold reached
MQL
SLA starts Review Accepted
SQL Opportunity Customer
Make rejection reasons count
A rejected MQL isn't a dead end. The rejection reason should decide what happens next. "Not the right time" might go into a longer-term nurture; "too small" might move to a self-serve onboarding track; "wrong contact" might trigger a search for the right person at the company. Rejection reasons are also the best feedback you'll get on your scoring model, so review them regularly.
Agree an SLA, and measure it
Speed matters. A high-intent lead contacted within hours converts far better than one contacted next week. Agree a response-time SLA with sales, automate the notifications and escalations, and report on SLA compliance alongside conversion rates.
Measure the funnel together
The B2B funnel should have one shared dashboard, jointly owned by marketing and sales. Useful metrics include:
- Lead to MQL conversion rate
- MQL acceptance rate (MQL to SQL)
- SQL to opportunity, and opportunity to customer rates
- SLA compliance and average response time
- Rejection reasons, and how they're trending
- Score distribution compared with outcomes, to check that higher scores really do convert better
When both teams look at the same numbers, conversations shift from "your leads are bad" to "this segment isn't converting, so let's change the scoring or the nurture".
Common mistakes to avoid
- Setting the MQL threshold once and forgetting it. Recalibrate it with sales after the first few months, using real conversion data.
- Stopping nurture at handoff. SQLs still benefit from relevant marketing content while sales works the deal.
- Ignoring trialists. If your product has a free trial, some of your best leads are already using it.
- No re-entry path. Rejected and lost leads should go back into an appropriate nurture, not disappear.
Next, in Part 4, we move from leads to customers and look at getting new users to first value faster. For the scoring model that powers the MQL threshold, see Lead scoring that sales trusts.