The Difference Between SDRs, BDRs and ADRs in B2B Sales

An SDR (sales development representative) prospects and books the first meeting. A BDR (business development representative) may do the same job under a different title, or focus on strategic work such as entering new markets and expanding existing accounts. An ADR (account development representative) qualifies and progresses opportunities after the initial sales conversation, helping determine which prospects are ready for an account executive.

The roles differ in what they own and how their performance is measured. SDRs focus on generating meetings, strategic BDRs develop markets and accounts, and ADRs work to turn initial conversations into qualified opportunities.

Where the funnel breaks down

The pipeline review usually goes the same way. SDRs hit their meeting number while account executives complain that their calendars are full of first calls that go nowhere. The CRM shows a healthy pipeline that the forecast doesn't believe, and the quarter still looks thin.

What's usually missing is an owner for the stretch between "we had a meeting" and "this is a real deal." memoryBlue, which staffs all three roles for its clients, makes the point on its ADR services page. Most companies staff the work of creating meetings and closing deals, and nobody owns deciding which meetings are real opportunities.

Part of the problem is that the titles blur together. When SDR and BDR mean the same job and no one holds the ADR title, a team can staff the whole funnel on paper while the stretch after the first meeting has no owner.

What does an SDR do?

The sales development representative owns the top of the funnel. In memoryBlue's definition, SDRs prospect across phone, email and LinkedIn and book qualified meetings on an account executive's calendar. They're measured on meetings booked, and their job answers the first question in any deal, which is whether the two companies should talk at all.

The core of that job is stable, but clients now expect more from the conversation that produces the meeting. Callum Mercer, a Senior Delivery Manager at memoryBlue who runs SDR teams for enterprise technology clients, told The Revenue Wire how that expectation has changed. "The bare bones of the SDR role remain the same, but enterprise customers expect a consultative, data-driven partner, not someone who simply books meetings," he said.

However consultative the conversation gets, the SDR hands off at the booked meeting, and whether it turns into a deal becomes someone else’s problem.

What does a BDR do?

Business development representative is the title that causes the most confusion, because companies use it in two different ways.

In the narrower definition, a BDR is a more strategic role. memoryBlue's SDR vs. BDR explainer describes BDRs as focused on relationship-building over first-touch lead generation. That work includes:

• Exploring new markets

• Identifying partnership opportunities

• Nurturing qualified leads further down the funnel

• Finding upsell and cross-sell opportunities in existing accounts

Under that definition, BDRs are assessed on the value of the relationships they build more than the volume of meetings they set.

In practice the line blurs, even on memoryBlue's own site. Its outsourced BDR services page describes BDR work in terms of lead generation and appointment setting, which is close to what its SDR teams do.

How a role is measured says more than what it's called. A rep measured on meetings booked is working as an SDR, whatever the business card says. One measured on new markets or account expansion is in the strategic BDR seat. Anyone expected to turn first meetings into qualified opportunities is doing ADR work, often without the title.

What does an ADR do?

The account development representative is the least familiar of the three titles, but it has the clearest job description. memoryBlue, which sells ADRs as a dedicated service, defines the role as the rep who picks up where the first meeting ends. An SDR's work stops at a booked meeting, and an ADR's starts there.

In practice that means four kinds of work:

• Qualification: structured discovery against a framework such as BANT or MEDDIC, or the company's own criteria, to confirm budget, authority, need and timeline

• Nurturing: keeping opportunities that aren't ready yet warm on a defined cadence, so they don't go quiet between sales conversations

• Recovery: re-engaging deals that have stalled or gone cold, then reviving or disqualifying them so they stop inflating the forecast

• Handoff: booking the qualified meeting on the AE's calendar with call notes and context, so the closer walks in prepared

ADRs are measured on opportunities created and progressed. Their job is to find out whether a first meeting has a real opportunity behind it.

memoryBlue's operations leaders see the same middle layer from the delivery side. Hannah Allen, the company's Director of Global Operations, described it to The Revenue Wire under a different title, internal sales representative. "It's almost a closing role," she said. "Instead of just having an appointment booked and an appointment occurred, we're then having two, three, four, or maybe five more meetings with that prospect to really qualify it to the point where they say 'okay, now let's run a POC.'"

She also pointed to what the role does for reps. "A lot of our reps come into the SDR role knowing that they're not going to stay as an SDR forever. They want to become an account executive. This lets them see what happens in that middle ground."

When does a team need each role?

An ADR has nothing to qualify until meetings are coming in, so memoryBlue’s guidance is to build top-of-funnel volume first and add ADRs once there’s pipeline to convert.

Start with SDRs when the problem is too few conversations. If AEs have open calendar time and the pipeline is thin, more qualification won't fix it, because there isn't enough coming in to qualify.

Add a strategic BDR when growth depends on work an SDR isn't built for, such as entering new markets or expanding inside existing accounts. memoryBlue's explainer notes that BDRs typically bring more experience than an entry-level SDR seat and cost more as a result.

Add ADRs when meetings are coming in but not turning into deals. memoryBlue's ADR page lists the signals that usually show up first:

• Low meeting-to-opportunity conversion, where meetings land but too few become qualified pipeline

• Overloaded AEs spending their time on early discovery and follow-up, which means paying AE-level cost for work that doesn't need an AE

• Inbound overflow, where leads arrive faster than the team can work them and cool off

• Deals going dark mid-cycle with nobody assigned to revive or disqualify them

• Slowing pipeline velocity because nobody owns moving deals between stages

• Late disqualification, where AEs find out three calls in that a deal was never real

The same page singles out teams running both inbound and outbound, where qualification standards have to stay consistent across both sources, along with multi-stakeholder enterprise sales that need sustained nurturing. Tom Morley, a Senior Delivery Manager at memoryBlue, has described what's at stake in enterprise accounts, where every AE hour is expensive. "If we waste that AE's time, it breaks relationships," he said.

Should the middle of the funnel be built or outsourced?

Most companies already pay for the first and last stages. Without a dedicated owner, the middle tends to fall to the AEs, who have the least time for it and the most expensive hours. Hiring for it in-house means defining a new role, writing its comp plan, training reps on a qualification framework and managing one more handoff.

The other route is outsourcing, which is how memoryBlue built its business. The company runs SDR, ADR and AE services as one continuum, so an opportunity can move from first conversation to qualified pipeline without changing vendors at each handoff. Clients don't have to buy the full set. memoryBlue says plenty of clients start with a single service and expand later, which fits the hiring order above.

ADR work is usually priced on its own terms. memoryBlue's ADR page says most ADR programs run on a retainer, since success shows up in qualified opportunities and pipeline health, which don't reduce to a single countable unit the way a booked meeting does. The company's audition-to-hire model also applies across its reps, so a company that eventually wants the role in-house can hire a proven rep onto its own payroll instead of starting a search from scratch.

For teams comparing the cost of the two routes, The Revenue Wire's breakdown of in-house versus outsourced SDR costs walks through the full math.

Frequently asked questions

What is the difference between an SDR and a BDR?
An SDR prospects and books first meetings and is measured on meetings booked. BDR is used two ways, sometimes as another name for the same job and sometimes for a more strategic role focused on new markets and existing accounts. How the role is measured says more than its title.

What does ADR stand for in sales?
ADR stands for account development representative. An ADR takes over after the first meeting, qualifying the opportunity against a framework like BANT or MEDDIC and progressing it until it's ready for an account executive.

What is the difference between an SDR and an ADR?
An SDR's job ends at the booked meeting, and an ADR's job starts there. The SDR answers "should we talk?" and the ADR answers "is there a real opportunity here?"

What is the difference between an ADR and an AE?
ADRs qualify and progress opportunities, while AEs run the evaluation and negotiation and close the deal. An ADR is measured on opportunities created, and an AE is measured on revenue won.

Do I need ADRs if I already have SDRs and AEs?
Often, yes. SDRs focus on new meetings and AEs focus on closing, so neither role is built to own the qualification and nurturing in between. Low meeting-to-opportunity conversion and AEs spending time on deals that were never real are the usual signs.

Can SDR and ADR work be outsourced together?
Yes. Providers such as memoryBlue run SDR, ADR and AE services as one continuum, so opportunities don't fall into a gap between vendors at each handoff.