Picking a contract development and manufacturing organization is one of the largest commitments a biotech company makes before it has a product on the market. The partner handles production, quality testing, and documentation for batches that may represent months of funding. A weak fit shows up as missed timelines, failed lots, and awkward conversations with investors.

Most selection processes lean on price and availability. Those matter, but they say little about what happens inside a batch. This guide covers what to check on capacity, track record, and monitoring, and how to turn those checks into a scorecard your team can use.

Start With Capacity You Can Actually Use

A CDMO’s listed capacity and its available capacity are different numbers. Ask how much suite time or bioreactor volume is booked over the next 12 to 18 months, and how the partner handles a program that grows faster than planned. A facility running near full utilization may quote a fast start, then push your second batch back by a quarter.

Match the scale to your program stage. A partner built for commercial volume may treat an early clinical batch as a low priority, while a small specialist may not have the equipment you need at Phase 3. Ask for a written scale-up path so you know where the relationship can go before you sign.

Look at Track Record Beyond the Brochure

Every CDMO has a list of logos. What you need is evidence on programs like yours. Ask how many batches of your modality the site has produced, how many passed release on the first attempt, and how many needed investigations or reruns. Then check these areas:

• Regulatory history: inspection outcomes and how the partner resolved any observations.
• Comparable programs: batches of the same modality and a similar scale.
• Staff continuity: how long the people who will run your project have been at the site.
• Customer references: calls with clients whose projects hit trouble, not only the smooth ones.

References deserve extra attention. Ask for a client whose project ran into a problem and listen to how the partner handled it. Candor in that conversation tells you more than a clean case study.

Ask How Each Production Run Is Monitored

Quality at a CDMO is largely a question of how early problems get caught. Traditional workflows test samples at set points and review results after the fact. If a culture drifts at hour 40, the team may not know until a release test days later, by which time the batch is lost along with the weeks of work behind it.

Ask a prospective partner whether they use cellular process analytical technology, because it shows how closely they track batch quality before anything ships. A partner that measures cells during the run can flag drift, adjust, or stop early, and can show you the record afterward.

Standard release testing still applies. Monitoring adds information while a batch is still running, which gives your team a chance to act. Ask which measurements are taken, how often, who reviews them, and whether the data is shared with you in real time or only in a final report.

Check How Documentation Works

A batch record is the document your regulators and future partners will read. Ask to see a redacted example and look at how much detail is captured on deviations, material lots, equipment settings, and in-process results. Clear, complete records make tech transfers and filings easier. Thin records create work for you later.

Data Access and Ownership

Confirm in the contract that you own the data and can export it in a usable format. A partner that holds results in a closed system can slow down a later transfer to another site.

Deviation and Change Handling

Ask how deviations are reported, how quickly you hear about them, and who signs off on process changes. You want to hear about a problem from the partner on the day it happens, not in a monthly summary.

Build a Scorecard Before You Visit

Site visits go better when the team agrees on criteria first. A short scorecard keeps the decision tied to evidence instead of the best presentation in the room.

• Capacity: available slots, scale-up path, and backup plans if equipment fails.
• Track record: comparable batches, first-pass release rate, and inspection history.
• Monitoring: what is measured during a run, how often, and who reviews it.
• Documentation: batch record quality, data access, and deviation reporting.
• Commercial terms: pricing model, change-order rules, and exit provisions.

Weight each category by your program’s risk. An early-stage startup with one lead candidate may care most about speed and monitoring, while a company approaching filing may weight documentation and inspection history more heavily.

Weigh Price Against the Cost of a Failed Batch

Price comparisons between CDMOs are easy to make and easy to get wrong. A lower quote with weak monitoring can cost more once you add one failed batch, a delayed milestone, and the investor update that goes with them. Compare quotes against the expected cost of rework, not only the line items.

Choosing a contract manufacturer sets the risk profile of your program. Check capacity you can use, ask for evidence of comparable work, and look closely at how each run is monitored and documented. Partners that welcome those questions are usually the ones worth signing.