Questions to Ask a System Integrator Before You Sign

By MillBrief Editorial · Published 2026-07-02 · Updated 2026-07-02

The gap between a good integrator and a bad one shows up in the questions they will and won’t answer in writing. Before you sign anything, work through a checklist across five themes: track record, scope and acceptance, spares and support, documentation and training, and money. The point is not to catch anyone out. It is to find where a firm goes vague, because the vague spots are exactly where your project will later overrun.

What experience and references should I ask about?

Ask the integrator to name three completed builds similar to yours, with reachable contacts. Track record is the single best predictor of whether a firm can deliver your job, and specifics matter more than logos on a slide. Ask which of those projects they installed versus merely supplied parts for, and who ran the programming. According to the International Federation of Robotics (IFR, 2025), a record 542,000 industrial robots were installed worldwide in 2024, so plenty of firms have volume experience — but volume in automotive says little about your packaging line. A red-flag answer sounds like “we’ve done hundreds of these” with no names, no contacts, and no project you can actually visit.

CSIA certification is one neutral signal worth asking about. According to the Control System Integrators Association (CSIA, 2024), certification requires passing an independent third-party audit against roughly 80 criteria — covering project management, financial tracking, quality and system development — repeated on about a three-year cycle. CSIA, founded in 1994, lists roughly 500 member firms across about 35 countries. Certification signals mature internal process, not guaranteed fit for your application, so treat it as a plus rather than a filter. A red flag is a firm that claims certification you cannot verify on the CSIA member list.

How do I lock down scope and acceptance criteria?

Insist on a written scope of work and a documented acceptance test the integrator must pass before you pay in full. Loose scope is where budgets die. According to Engineering, Technology & Applied Science Research (ETASR, 2024), design changes drive roughly 56.5% of cost overruns and 40% of delays on large capital projects, and planning errors account for about 34.5% of overruns. Ask exactly what “done” means: throughput rate, uptime target, defect rate, and cycle time, all in numbers. A red-flag answer is “we’ll sort out the details once we start” — that is an open invitation to change orders.

Ask specifically for a Factory Acceptance Test (FAT) and a Site Acceptance Test (SAT). According to ANSI/ISA (via ANSI/ISA-62381, with the IEC edition updated in 2024), these standards define the procedures for FAT, SAT and site integration testing of automation systems. A FAT verifies the system at the integrator’s shop before shipping; the SAT re-verifies it on your floor. Get the test protocol in writing, tied to the acceptance criteria above. Also ask which safety standard the build meets — for industrial robot cells, the relevant U.S. reference is the ANSI/RIA R15.06 robot safety standard. A red flag is any reluctance to commit to a written test plan.

What should I ask about spares and support?

Ask for guaranteed response times, a recommended spare-parts list, and clear code ownership before you buy. When the line stops, support quality decides how long it stays stopped. Get response and on-site times in writing — remote in four hours, on-site next business day, or whatever your operation can tolerate. Ask for a priced list of critical spares to stock, since a single unavailable drive or sensor can idle a cell for days. A red-flag answer is “just call us if something breaks,” with no SLA and no spares list.

Ask who owns the PLC and HMI source code, and get the answer in the contract. You want commented, editable source code and all passwords handed over at completion. If the integrator locks the code, every future tweak runs through them at their rate. According to Salary.com (2025), a control systems integrator averaged about $52.66/hour ($109,527/year) as of November 2025, so tie-in gets expensive fast. A red flag is a firm that keeps code proprietary or charges extra to “release” it later — walk if they won’t budge.

What documentation and training are non-negotiable?

Require a full documentation package and hands-on operator and maintenance training as a condition of final sign-off. A cell nobody on your staff can run or repair is a liability, not an asset. The package should include electrical drawings, I/O lists, a bill of materials, network diagrams, the operator manual and a preventive-maintenance schedule. Ask for training for both operators and your maintenance technicians, with the number of sessions specified. A red-flag answer is “documentation is extra” or training limited to a single hurried afternoon at handover.

Ask how the system is built for the people who will actually maintain it — the in-house electro-mechanical and electrical technicians who inherit the cell once the integrator leaves. Ask whether components are standard, off-the-shelf parts your team can source, or proprietary items only the integrator can supply. A red flag is a design built around obscure parts that lock you into one vendor for the life of the equipment.

Which commercial terms actually protect me?

Tie payments to milestones, cap your up-front exposure, and pin down warranty length before signing. Payment structure is leverage. Structure it so meaningful portions release only after FAT and SAT sign-off, not on a calendar date. Large up-front payments shift risk to you and weaken your position if the schedule slips — and, as the ETASR (2024) overrun data above suggests, schedules do slip. A red-flag answer is a demand for most of the money before the build is proven.

Ask what the price actually covers, because the arm is the small part. According to the Association for Advancing Automation (A3, 2024), the robot arm is typically only about one-third of an integrated turnkey system’s installed cost; the rest is design, tooling, guarding, integration and programming. Standard Bots (2026) puts a fully deployed cell at roughly $80,000-$400,000, with installation and programming often adding 20-50% of the base robot price (as of 2026). Get warranty terms, spare-part lead times and change-order rates in writing. If the quote is a single lump sum with no breakdown, that opacity is itself the red flag — and reason enough to hold off.

For help structuring the tender and comparing bids, see the automation RFQ guide and system integrator rates. To understand where these projects go wrong, read why automation projects fail, and for the basics of the role, what is a system integrator.