Occupation AtlasWind Turbine Service Technicians

O*NET · 49-9081.00

Wind Turbine Service Technicians

Inspect, diagnose, adjust, or repair wind turbines. Perform maintenance on wind turbine equipment including resolving electrical, mechanical, and hydraulic malfunctions.

Also called Commissioning Tech · Commissioning Tech (Commissioning Technician) · Energy Technician · Field Service Technician · Offshore Wind Turbine Technician · Onsite Tech · Onsite Technician (Onsite Tech) · Renewable Energy Specialist
26 more

Renewable Energy Technician · Service Technician · Small Wind Energy Installer · Troubleshooter · Troubleshooting Technician · Turbine Technician · Wind Commissioning Technician · Wind Energy Mechanic · Wind Energy Systems Installer · Wind Energy Technician · Wind Farm Support Specialist · Wind Generating Electric Power Installer · Wind Plant Technician · Wind Power Technician · Wind Technician · Wind Turbine Blade Composite Tech · Wind Turbine Blade Composite Technician (Wind Turbine Blade Composite Tech) · Wind Turbine Blade Repair Technician · Wind Turbine Installer · Wind Turbine Mechanic · Wind Turbine Operator · Wind Turbine Service Technician · Wind Turbine Technician · Wind Turbine Troubleshooting Technician · Windmill Technician · Windsmith

Job Zone 3 — Medium Preparation NeededHolland code RCI35 skills on file

Compare with another occupationCompare with Industrial Machinery Mechanics

Job Zone

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5

Zone 3: Medium Preparation Needed

Medium preparation. Vocational training, related on-the-job experience, or an associate degree, with one to two years of training that combines experience and informal instruction.

Job Zone is O*NET's rating of how much education, experience and training an occupation typically needs — a property of the work, not of anyone doing it.

Occupational interest profile

RCIRealistic · Conventional · Investigative — the three strongest interests, in order

  • R Realistic7.00
  • C Conventional4.29
  • I Investigative3.60
  • E Enterprising1.77
  • S Social1.62
  • A Artistic1.00

RIASEC (Holland) interests on O*NET's 0–7 scale: what the work draws on, not what any individual prefers. Hover a row for what each dimension means.

Education and experience

The education level respondents say the job requires, and the most common answer for experience and training.

  • High School Diploma or the equivalent29%
  • Post-Secondary Certificate34%
  • Some College Courses22%
  • Associate's Degree or other 2-year degree15%
Related work experience
Over 1 year, up to and including 2 years (33%)
On-site or in-plant training
Over 6 months, up to and including 1 year (26%)
On-the-job training
Over 6 months, up to and including 1 year (46%)

Typically associated skills

All 35 O*NET skills, most important first. Importance (1–5) says how much a skill matters here; level (0–7) says how much of it the work calls for, with O*NET's example of a nearby level. Neither is a proficiency rating of a person.

  • TroubleshootingImportance 4.0Level 4.0Level 4 looks like: Identify the circuit causing an electrical system to fail
  • RepairingImportance 4.0Level 3.9Level 4 looks like: Replace a faulty hydraulic valve
  • Equipment MaintenanceImportance 4.0Level 3.8Level 4 looks like: Clean moving parts in production machinery
  • Operations MonitoringImportance 4.0Level 3.3Level 4 looks like: Monitor machine functions on an automated production line
  • Critical ThinkingbasicImportance 3.5Level 3.1Level 4 looks like: Evaluate customer complaints and determine appropriate responses
  • Reading ComprehensionbasicImportance 3.3Level 3.3Level 4 looks like: Understand an email from management describing new personnel policies
  • MonitoringbasicImportance 3.3Level 3.1Level 4 looks like: Monitor a meeting and revise the agenda to ensure important topics are discussed
  • Quality Control AnalysisImportance 3.3Level 3.1Level 4 looks like: Assess new parts for precision and accuracy to specifications
  • Complex Problem SolvingImportance 3.3Level 3.0Level 2 looks like: Lay out tools to complete a job
  • Active LearningbasicImportance 3.1Level 3.1Level 4 looks like: Determine the impact of new menu changes on a restaurant's purchasing requirements
  • Active ListeningbasicImportance 3.1Level 3.1Level 4 looks like: Answer inquiries regarding credit references
  • Operation and ControlImportance 3.1Level 3.1Level 4 looks like: Adjust the speed of assembly line equipment based on the product being assembled
Show the other 23
  • Systems AnalysisImportance 3.1Level 3.1Level 4 looks like: Determine how a new piece of equipment will affect production rates
  • Judgment and Decision MakingImportance 3.1Level 3.0Level 2 looks like: Decide how scheduling a break will affect work flow
  • SpeakingbasicImportance 3.1Level 3.0Level 2 looks like: Greet tourists and explain tourist attractions
  • Systems EvaluationImportance 3.1Level 3.0Level 2 looks like: Determine why estimates for the time to complete a task are overly optimistic
  • CoordinationImportance 3.0Level 3.3Level 4 looks like: Work with others to put a new roof on a house
  • Learning StrategiesbasicImportance 3.0Level 3.0Level 2 looks like: Learn a different method of completing a task from a coworker
  • Equipment SelectionImportance 3.0Level 2.9Level 2 looks like: Select a tool to adjust a loose part on a bicycle
  • InstructingImportance 3.0Level 2.9Level 2 looks like: Instruct a new employee in the use of a timekeeping system
  • Time ManagementImportance 3.0Level 2.9Level 2 looks like: Keep a monthly calendar of appointments
  • WritingbasicImportance 2.9Level 2.8Level 2 looks like: Write down a guest's order at a restaurant
  • Social PerceptivenessImportance 2.8Level 2.8Level 2 looks like: Notice that customers are angry because they have been waiting too long
  • Management of Personnel ResourcesImportance 2.6Level 2.5Level 2 looks like: Encourage a coworker who is having difficulty finishing a project
  • Management of Material ResourcesImportance 2.3Level 2.3Level 2 looks like: Reserve a room for a management meeting
  • Service OrientationImportance 2.3Level 2.1Level 2 looks like: Ask customers if they would like a cup of coffee
  • MathematicsbasicImportance 2.1Level 2.8Level 2 looks like: Count the amount of change to be given to a customer
  • NegotiationImportance 2.1Level 1.9Level 2 looks like: Present justification to a manager for altering a work schedule
  • SciencebasicImportance 2.0Level 2.0Level 2 looks like: Conduct standard tests to determine soil quality
  • PersuasionImportance 2.0Level 1.8Level 2 looks like: Solicit donations for a charity
  • InstallationImportance 1.9Level 1.1Level 2 looks like: Install a new air filter in an air conditioner
  • Technology DesignImportance 1.8Level 1.5Level 2 looks like: Adjust exercise equipment for use by a customer
  • Management of Financial ResourcesImportance 1.6Level 1.0Level 2 looks like: Use available funds to buy office supplies and record the amount of the purchase
  • Operations AnalysisImportance 1.6Level 1.0Level 2 looks like: Select a printer for an office
  • ProgrammingImportance 1.6Level 0.6

Tasks

10 core · 2 supplemental

What people in this occupation do, as O*NET records it, core tasks first by importance (1–5).

  1. Troubleshoot or repair mechanical, hydraulic, or electrical malfunctions related to variable pitch systems, variable speed control systems, converter systems, or related components.Importance 4.7
  2. Diagnose problems involving wind turbine generators or control systems.Importance 4.6
  3. Perform routine maintenance on wind turbine equipment, underground transmission systems, wind fields substations, or fiber optic sensing and control systems.Importance 4.6
  4. Test electrical components of wind systems with devices, such as voltage testers, multimeters, oscilloscopes, infrared testers, or fiber optic equipment.Importance 4.6
  5. Climb wind turbine towers to inspect, maintain, or repair equipment.Importance 4.5
  6. Start or restart wind turbine generator systems to ensure proper operations.Importance 4.5
  7. Test structures, controls, or mechanical, hydraulic, or electrical systems, according to test plans or in coordination with engineers.Importance 4.1
  8. Maintain tool and spare parts inventories required for repair, installation, or replacement services.Importance 4.1
  9. Collect turbine data for testing or research and analysis.Importance 3.8
  10. Train end-users, distributors, installers, or other technicians in wind commissioning, testing, or other technical procedures.Importance 3.8
Show the other 2
  1. Inspect or repair fiberglass turbine blades.Importance 3.5
  2. Assist in assembly of individual wind generators or construction of wind farms.Importance 3.1

Knowledge

Bodies of knowledge the work draws on.

  • MechanicalImportance 4.5Level 5.9
  • Computers and ElectronicsImportance 4.2Level 4.9Level 4 looks like: Use a computer to format a document
  • English LanguageImportance 4.0Level 3.6Level 4 looks like: Edit an article for a news website
  • Engineering and TechnologyImportance 3.7Level 4.1Level 4 looks like: Design a custom office chair
  • Public Safety and SecurityImportance 3.7Level 3.9Level 4 looks like: Inspect a building site for safety violations
  • Administration and ManagementImportance 3.3Level 3.1Level 4 looks like: Monitor progress of a project to ensure timely completion
  • Building and ConstructionImportance 3.3Level 4.2Level 4 looks like: Fix a plumbing leak in the ceiling
  • Education and TrainingImportance 3.3Level 3.9Level 4 looks like: Lead a quality improvement seminar
Show all 33
  • MathematicsImportance 3.3Level 3.7Level 4 looks like: Analyze data to determine areas with the highest sales
  • PhysicsImportance 3.1Level 3.6Level 4 looks like: Calculate the speed of a falling object
  • AdministrativeImportance 3.0Level 3.8Level 4 looks like: Type 30 words per minute
  • Customer and Personal ServiceImportance 2.9Level 2.5Level 1 looks like: Process a customer's dry-cleaning drop off
  • TelecommunicationsImportance 2.9Level 2.9
  • TransportationImportance 2.8Level 2.8
  • DesignImportance 2.6Level 2.7
  • Production and ProcessingImportance 2.6Level 2.9
  • Personnel and Human ResourcesImportance 2.5Level 2.4Level 1 looks like: Fill out a medical claim form
  • Economics and AccountingImportance 2.4Level 1.9Level 1 looks like: Answer billing questions from credit card customers
  • GeographyImportance 2.3Level 2.2Level 1 looks like: Know the capital of the United States
  • Law and GovernmentImportance 2.3Level 1.9Level 1 looks like: Describe the length of a U.S. presidential term
  • Medicine and DentistryImportance 2.2Level 1.8Level 1 looks like: Use a band-aid
  • PsychologyImportance 2.1Level 2.4Level 1 looks like: Monitor several children on a playground
  • ChemistryImportance 2.0Level 2.4Level 1 looks like: Use a common household bug spray
  • Communications and MediaImportance 1.8Level 1.3Level 1 looks like: Write a thank you note
  • Foreign LanguageImportance 1.7Level 1.4Level 1 looks like: Say "please" and "thank you" in a foreign language
  • Sales and MarketingImportance 1.7Level 1.4Level 1 looks like: Sell cakes at a bake sale
  • BiologyImportance 1.4Level —
  • Food ProductionImportance 1.4Level —
  • History and ArcheologyImportance 1.4Level 0.8Level 1 looks like: Take a class in US history
  • Therapy and CounselingImportance 1.4Level 1.0Level 1 looks like: Put ice on a sprained ankle
  • Philosophy and TheologyImportance 1.3Level 0.7Level 1 looks like: Watch a TV show on family values
  • Sociology and AnthropologyImportance 1.3Level —
  • Fine ArtsImportance 1.2Level —

Abilities

Enduring capacities the work calls for.

  • Problem SensitivityImportance 4.0Level 3.6Level 4 looks like: Notice from a subtle difference in a client's mood that something is bothering them
  • Finger DexterityImportance 3.8Level 3.5Level 4 looks like: Attach small dials to audio equipment on an assembly line
  • Near VisionImportance 3.8Level 3.9
  • Oral ComprehensionImportance 3.8Level 4.0Level 4 looks like: Understand a coach's oral instructions for a sport
  • Arm-Hand SteadinessImportance 3.6Level 3.4Level 4 looks like: Thread a needle
  • Deductive ReasoningImportance 3.6Level 3.9
  • Manual DexterityImportance 3.6Level 3.1Level 4 looks like: Pack oranges in crates as quickly as possible
  • Control PrecisionImportance 3.3Level 3.9Level 4 looks like: Adjust farm tractor controls
Show all 52
  • Inductive ReasoningImportance 3.3Level 3.1Level 4 looks like: Determine the prime suspect based on crime scene evidence
  • Information OrderingImportance 3.3Level 3.3Level 2 looks like: Follow the correct steps to make change
  • Multilimb CoordinationImportance 3.3Level 3.6Level 4 looks like: Operate a forklift truck in a warehouse
  • Oral ExpressionImportance 3.3Level 3.6Level 4 looks like: Give instructions to a lost motorist
  • VisualizationImportance 3.3Level 3.6Level 4 looks like: Follow a diagram to assemble a metal storage cabinet
  • Written ComprehensionImportance 3.3Level 3.3Level 4 looks like: Understand an apartment lease
  • Category FlexibilityImportance 3.1Level 3.1Level 3 looks like: Classify flowers according to size, color, and smell
  • Dynamic StrengthImportance 3.1Level 3.3Level 2 looks like: Use pruning shears to trim a bush
  • Extent FlexibilityImportance 3.1Level 3.9Level 4 looks like: Reach for a box on a high warehouse shelf
  • Far VisionImportance 3.1Level 3.4Level 4 looks like: Read the slides on a presentation from across a room
  • Flexibility of ClosureImportance 3.1Level 3.4Level 4 looks like: Look for a golf ball in tall grass
  • Gross Body EquilibriumImportance 3.1Level 3.0Level 2 looks like: Stand on a ladder
  • Perceptual SpeedImportance 3.1Level 3.1Level 4 looks like: Read five pressure indicators in 10 seconds to make sure each is within safe limits
  • Selective AttentionImportance 3.1Level 3.1Level 4 looks like: Watch security monitors for intruders throughout the night shift
  • Trunk StrengthImportance 3.1Level 3.3Level 4 looks like: Shovel snow for half an hour
  • Auditory AttentionImportance 3.0Level 3.0Level 2 looks like: Listen to a lecture while people nearby are talking
  • Reaction TimeImportance 3.0Level 3.0Level 2 looks like: Start to slow down the car when a traffic light turns yellow
  • Speech ClarityImportance 3.0Level 3.0Level 4 looks like: Make stadium-wide announcements during a sporting event
  • Speech RecognitionImportance 3.0Level 3.0Level 2 looks like: Recognize the voice of a coworker
  • StaminaImportance 3.0Level 3.0Level 4 looks like: Climb 6 flights of stairs
  • Static StrengthImportance 3.0Level 3.1Level 4 looks like: Pull a 40-pound sack of fertilizer across the lawn
  • Written ExpressionImportance 3.0Level 2.9
  • Depth PerceptionImportance 2.9Level 2.9Level 2 looks like: Merge a car into traffic on a city street
  • Gross Body CoordinationImportance 2.9Level 2.9Level 2 looks like: Get in and out of a truck
  • Hearing SensitivityImportance 2.9Level 3.0Level 2 looks like: Notice a doorbell ringing
  • Response OrientationImportance 2.9Level 2.9Level 2 looks like: When a doorbell and phone ring at the same time, quickly select which to answer first
  • Time SharingImportance 2.9Level 3.1Level 3 looks like: Watch street signs while driving at 30 miles an hour
  • Visual Color DiscriminationImportance 2.9Level 3.1Level 4 looks like: Trace electrical circuits marked by various colored wires
  • Fluency of IdeasImportance 2.8Level 3.1Level 4 looks like: Think of as many ideas as possible for the name of a new company
  • MemorizationImportance 2.8Level 2.9
  • OriginalityImportance 2.8Level 2.9Level 2 looks like: Use a credit card to open a locked door
  • Speed of ClosureImportance 2.8Level 2.8Level 3 looks like: Recognize a song after hearing only the first few notes
  • Rate ControlImportance 2.3Level 2.1Level 1 looks like: Ride a bicycle alongside a jogger
  • Wrist-Finger SpeedImportance 2.3Level 2.1Level 2 looks like: Use a screwdriver to twist in a screw
  • Glare SensitivityImportance 2.1Level 2.4Level 2 looks like: Drive on a familiar road on a cloudy day
  • Mathematical ReasoningImportance 2.1Level 2.3Level 1 looks like: Determine how much 20 oranges will cost when they are priced at 5 for 4 dollars
  • Number FacilityImportance 2.1Level 2.3Level 3 looks like: Calculate a discounted price
  • Peripheral VisionImportance 2.0Level 1.6Level 2 looks like: Keep in step while marching in a band
  • Sound LocalizationImportance 2.0Level 2.0Level 2 looks like: Listen to a sound system to determine which speaker is working
  • Spatial OrientationImportance 2.0Level 1.9Level 2 looks like: Use the floor plan to locate a store in a mall
  • Speed of Limb MovementImportance 1.9Level 1.8Level 2 looks like: Saw through a thin piece of wood
  • Dynamic FlexibilityImportance 1.8Level 0.8
  • Explosive StrengthImportance 1.6Level 0.9
  • Night VisionImportance 1.6Level 0.8

Work activities

Kinds of activity the work is made of.

  • Repairing and Maintaining Mechanical EquipmentImportance 4.9Level 6.0Level 7 looks like: Overhaul a power plant turbine
  • Repairing and Maintaining Electronic EquipmentImportance 4.8Level 5.9
  • Inspecting Equipment, Structures, or MaterialsImportance 4.7Level 4.8Level 4 looks like: Inspect equipment in a chemical processing plant
  • Controlling Machines and ProcessesImportance 4.6Level 5.8
  • Handling and Moving ObjectsImportance 4.5Level 6.1Level 7 looks like: Load boxes on an assembly line
  • Performing General Physical ActivitiesImportance 4.5Level 6.3Level 7 looks like: Climb up and down poles to install electricity
  • Making Decisions and Solving ProblemsImportance 4.3Level 3.9Level 4 looks like: Select the location for a major retail store
  • Operating Vehicles, Mechanized Devices, or EquipmentImportance 4.3Level 3.9Level 4 looks like: Drive an 18-wheel tractor-trailer
Show all 41
  • Communicating with Supervisors, Peers, or SubordinatesImportance 4.2Level 4.8Level 4 looks like: Report the results of a sales meeting to a supervisor
  • Getting InformationImportance 4.2Level 3.4Level 4 looks like: Review a budget
  • Evaluating Information to Determine Compliance with StandardsImportance 4.1Level 3.7Level 4 looks like: Evaluate a complicated insurance claim for compliance with policy terms
  • Organizing, Planning, and Prioritizing WorkImportance 4.1Level 4.6Level 4 looks like: Plan and adjust a personal to-do list according to changing demands
  • Documenting/Recording InformationImportance 4.0Level 4.1Level 4 looks like: Document the results of a crime scene investigation
  • Identifying Objects, Actions, and EventsImportance 4.0Level 3.9Level 4 looks like: Judge the suitability of food products for an event
  • Processing InformationImportance 4.0Level 3.9Level 4 looks like: Calculate the adjustments for insurance claims
  • Training and Teaching OthersImportance 4.0Level 3.9Level 4 looks like: Teach a social sciences course to high school students
  • Monitoring Processes, Materials, or SurroundingsImportance 3.9Level 4.8Level 4 looks like: Test electrical circuits
  • Updating and Using Relevant KnowledgeImportance 3.9Level 4.7Level 4 looks like: Keep current on changes in maintenance procedures for repairing sports cars
  • Working with ComputersImportance 3.9Level 3.7Level 4 looks like: Write software for keeping track of parts in inventory
  • Analyzing Data or InformationImportance 3.8Level 3.7Level 4 looks like: Determine the interest cost to finance a new building
  • Developing and Building TeamsImportance 3.5Level 3.5Level 4 looks like: Lead an assembly team in an automobile plant
  • Coordinating the Work and Activities of OthersImportance 3.4Level 3.9Level 4 looks like: Organize the cleanup crew after a major sporting event
  • Estimating the Quantifiable Characteristics of Products, Events, or InformationImportance 3.4Level 3.3Level 4 looks like: Estimate the time required to evacuate a city in the event of a major disaster
  • Developing Objectives and StrategiesImportance 3.3Level 2.7
  • Judging the Qualities of Objects, Services, or PeopleImportance 3.3Level 3.7Level 4 looks like: Determine the value of property lost in a fire
  • Assisting and Caring for OthersImportance 3.2Level 3.8Level 4 looks like: Help a medical patient find in-home assistance or healthcare
  • Coaching and Developing OthersImportance 3.2Level 4.0Level 4 looks like: Provide on-the-job training for administrative workers
  • Establishing and Maintaining Interpersonal RelationshipsImportance 3.2Level 4.4Level 4 looks like: Maintain good working relationships with almost all coworkers and clients
  • Guiding, Directing, and Motivating SubordinatesImportance 3.2Level 3.1Level 4 looks like: Manage a small team of employees in a dynamic workplace
  • Interpreting the Meaning of Information for OthersImportance 3.2Level 3.4Level 4 looks like: Interpret how foreign tax laws apply to U.S. exports
  • Performing Administrative ActivitiesImportance 3.1Level 2.8
  • Scheduling Work and ActivitiesImportance 3.1Level 3.3Level 4 looks like: Prepare the work schedule for salesclerks in a large retail store
  • Thinking CreativelyImportance 3.1Level 3.9Level 4 looks like: Adapt popular music for a high school marching band
  • Drafting, Laying Out, and Specifying Technical Devices, Parts, and EquipmentImportance 2.8Level 3.4Level 4 looks like: Specify the furniture and equipment for a new school
  • Providing Consultation and Advice to OthersImportance 2.8Level 3.0Level 4 looks like: Recommend a new software package to increase operational efficiency
  • Resolving Conflicts and Negotiating with OthersImportance 2.8Level 3.3Level 4 looks like: Get two subordinates to agree about vacation schedules
  • Monitoring and Controlling ResourcesImportance 2.7Level 3.0Level 4 looks like: Work as a chef responsible for ordering food for the menu
  • Communicating with People Outside the OrganizationImportance 2.4Level 2.4Level 1 looks like: Have little contact with people outside the organization
  • Staffing Organizational UnitsImportance 2.0Level 1.4Level 1 looks like: Work in a position that has minimal staffing requirements
  • Selling or Influencing OthersImportance 1.8Level 1.6Level 1 looks like: Convince a coworker to assist with an assignment
  • Performing for or Working Directly with the PublicImportance 1.4Level —

Work context

The conditions most characteristic of the work, on O*NET's 1–5 context scale.

  • Exposed to High Places5.0
  • Wear Common Protective or Safety Equipment such as Safety Shoes, Glasses, Gloves, Hearing Protection, Hard Hats, or Life Jackets5.0
  • Wear Specialized Protective or Safety Equipment such as Breathing Apparatus, Safety Harness, Full Protection Suits, or Radiation Protection5.0
  • Exposed to Hazardous Conditions4.9
  • Face-to-Face Discussions with Individuals and Within Teams4.9
  • Consequence of Error4.8
  • E-Mail4.8
  • Exposed to Cramped Work Space, Awkward Positions4.8
  • Indoors, Not Environmentally Controlled4.8
  • Outdoors, Exposed to All Weather Conditions4.8

Technology

17 tools

Software used in this work. In demand: among the tools job postings for this occupation name most. Hot: often named in job postings across the economy.

In demand (4)

  • Microsoft Excelhot
  • Microsoft Office softwarehot
  • Microsoft Outlookhot
  • Microsoft PowerPointhot

Hot (5; 4 more marked hot above)

  • Microsoft Access
  • Microsoft Project
  • Microsoft Word
  • SAP software
  • Structured query language SQL
Other tools (8)
  • Computerized diagnostic software
  • Computerized maintenance management system CMMS
  • IBM Maximo Asset Management
  • Industrial control systems software
  • Programmable logic controller PLC software
  • Supervisory control and data acquisition SCADA software
  • Vestas Wind Systems A/S Vestas Remote Panel
  • Web browser software

Related occupations

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ESCO equivalents

From the official ESCO–O*NET crosswalk, strongest match first. A broader occupation takes in this one; a narrower one is a part of it.

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This page includes information from the O*NET 31.0 Database by the U.S. Department of Labor, Employment and Training Administration (USDOL/ETA), used under the CC BY 4.0 license; O*NET® is a trademark of USDOL/ETA. ESCO occupations and skills are from the European Commission's ESCO classification, and the occupation crosswalk is the official ESCO–O*NET mapping by the ESCO Secretariat with USDOL/ETA. This service uses the ESCO classification of the European Commission. BlissPoint Analytics has modified all or some of this information: skill, task and descriptor ratings are rounded to one decimal, and ESCO occupations show Job Zone and interests copied from a crosswalked O*NET occupation. USDOL/ETA has not approved, endorsed, or tested these modifications.