STS Exam Domains 2026: Complete Guide to All 12 Content Areas

How the Twelve Content Areas Are Organized

Smart Technology Systems (STS) is an ETA International certification covering the installation, integration, and basic support of smart home and light commercial technology. The exam content comes from one official source: the Basic STS Certification Competency Requirements document, which lists twelve numbered top-level headings from 1.0 through 12.0. ETA states that its examination questions derive from these competencies, which makes the document the closest thing to an official syllabus.

One caveat shapes everything that follows. The competency PDF linked from ETA is dated May 25, 2022, and no separately numbered 2026 exam version has been verified. The domain list in this guide reflects the current published competencies, not a rebranded 2026 blueprint. These are also Basic STS objectives. They do not cover the separate STS endorsements or the STS Master Integrator level, so do not mix those scopes into your preparation.

Exam Format and Registration Mechanics

Before diving into content, it helps to know the container the content arrives in. The Basic STS is a proctored written knowledge examination, available online or on paper. ETA's shared STS exam-information table and its certification catalog both list 75-80 questions. The exact count for the core STS exam and the split between scored and unscored items are not publicly specified, so treat the range as the honest answer. The table also confirms that no hands-on assessment is required.

A few practical details matter on test day. A proctor and photo ID are required. ETA permits scratch paper and a nonprogrammable or scientific calculator, and used scratch paper must be surrendered at the end. Phones and other personal electronic devices are prohibited, and ETA's general rules bar leaving the room once testing starts. Remote candidates need a webcam, microphone, a suitable computer, and reliable connectivity, with registration arranged through ETA. Whether the exam is open or closed book, or adaptive, was not verified for STS specifically, so confirm those rules when you register.

If you want the full cost picture, including how the fee interacts with endorsements (ETA offers the core STS exam at half price when taken at the same time as at least one endorsement), read our STS certification cost breakdown. For scheduling logistics, see STS exam dates and testing windows.

Foundation Domains: Safety, Standards, and Electrical Basics

Three of the twelve areas form the conceptual base that everything else sits on. They are not glamorous, but they supply the vocabulary and reasoning the later domains assume.

Infrastructure Domains: Wiring, Connectors, and Pre-wiring

The next cluster is the physical backbone of a smart technology installation: the cable, the connectors on its ends, and the planning done before drywall goes up. This is where the credential feels most like a trade certification.

Domain 3: Low Voltage Wiring and Wireless Communication Technologies

This domain deliberately pairs wired and wireless approaches. A competent integrator must know when a cable is the right answer and when a wireless link is, and what each choice costs in reliability, range, and interference. Study the common cable categories used in residential systems, the signaling they carry, and the basic factors that degrade wireless performance, such as distance, building materials, and competing radio sources.

Domain 4: Cabling - Connectorization

Connectorization is a hands-on skill tested through a written exam. You will not terminate a cable in front of a proctor, since no hands-on assessment is required, but you should be able to reason about termination correctly.

• Termination standards and conductor ordering
• Common connector types for data, video, and audio
• Typical causes of poor terminations and how they show up as faults
• Why consistent termination practice makes later troubleshooting easier

Domain 5: Pre-wiring

Pre-wiring is the planning discipline of running cable before walls are closed. Questions here tend to reward judgment: where to place outlets and drops, how to leave service loops, how to route cable away from interference sources, and how to document what was installed. A mistake in pre-wire is expensive to fix later, which is why the competencies treat it as its own area.

Systems Domains: Communications and Management

With the infrastructure understood, two domains address what actually runs over it and how it is administered.

These two domains are the ones most likely to surprise candidates who come from a pure cabling background. Networking vocabulary and project-management reasoning are different muscles from termination skill, so give them deliberate attention.

Field Practice Domains: Tools, Restoration, Customers, Troubleshooting

The final four domains describe how a technician behaves on a real job from arrival to departure.

Domain 10: Tools and Equipment

You should recognize the standard tools of the trade, know what each is for, and understand the difference between a tool being appropriate and merely available. Think of the test equipment used to verify cable continuity and signal, the hand tools used for termination and mounting, and the access tools used to route cable through finished structures.

Domain 9: Premises Restoration

This is the area that most clearly separates smart home work from lab work. Installers cut holes, drill through framing, and run cable through finished spaces. Restoration covers leaving the premises in acceptable condition: patching penetrations, protecting finishes during work, and cleaning up. It also connects to safety and to fire-related considerations when penetrating walls and floors.

Domain 11: Customer Orientation and Documentation

Smart technology is sold into homes, so how the technician treats the client is part of the competency. Questions often present a scenario and ask for the most professional response.

• Communicating clearly with non-technical homeowners
• Setting expectations and handing over a finished system
• Documenting what was installed, including labels, diagrams, and settings
• Instructing customers on basic operation

Domain 12: Basic Troubleshooting

Troubleshooting ties the whole list together. A systematic approach (define the symptom, isolate the layer, test, correct, verify) draws on connectorization, communications, electrical basics, and tools all at once. Scenario questions here reward candidates who work from simple, common causes before exotic ones.

Sequencing Your Prep Around the Domains

The only study method worth covering here is ordering. Because the domains build on each other, a sensible sequence follows the dependency chain rather than the numbering. This sample plan is one option; adjust it to your background and the time you have. For a full preparation framework, see the STS study guide.

Troubleshooting goes last because it draws on everything before it. Finish with timed practice questions that mix domains, since the real exam will not group questions by topic. Our practice test is built for exactly that kind of mixed review, and our one-page cheat sheet works well for a final pass the day before. Keep the 75% threshold in mind as you measure readiness; the details are in our passing score guide.

Who Benefits From This Credential

STS is a stand-alone certification. Associate CET status and ETA membership are not required. The competency document highly recommends previous certifications such as CAT, DCI, DVE, FOI, FOT, FOT-OSP, or TTT, but those are recommendations, not prerequisites. ETA's Credly badge describes the audience as practicing technicians and requires acceptance of the ETA Code of Conduct, without a quantified minimum of experience. Read the full eligibility picture in our STS requirements guide.

In practice, the twelve domains describe the daily work of home technology integrators, security and AV installers, low-voltage contractors, cable and telecom technicians expanding into residential smart systems, and technicians employed by companies that install and support connected home equipment. Candidates already working in a related trade will find some domains familiar and others new; the unfamiliar ones, usually communications and management, are where to spend your time. If you are weighing the investment, our analysis of whether the STS certification is worth it and our look at STS jobs add context. For a sense of difficulty, see how hard the STS exam is, and for the pass-rate question, note that ETA has not publicly disclosed an STS-specific figure, as covered in our pass rate article.

Certification lasts four years and requires maintenance. For general non-hands-on maintenance, that means a maintenance form, USD 25 per year (USD 100 over four years), and either 10 continuing-education contact hours per year (40 over the cycle) or an Employer Verification Form completed by a supervisor. Annual submission is recommended, so it is worth building the habit early rather than scrambling in year four.

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