Technical & Scientific

Human Factors & User Experience

We provide forensic human factors and product failure analysis, as well as proactive product safety and user experience (UX) research along the product lifecycle.

J.S. Held owns and operates User Research Laboratories in New York City and Phoenix, Arizona.

Our human factors experts investigate and testify in myriad cases, including automotive accidents, premises liability, product liability / failure to warn, medical device failures, class action lawsuits, and Proposition 65 litigation. Our role advising clients throughout the product lifecycle, from ideation and interaction design through validation, distinctly qualifies us to assess subject allegations and render expert opinions based on scientific evidence and firsthand experience.

Our understanding of where things go wrong, and why, uniquely positions us as trusted advisors in product safety and user research - helping clients develop products and services that are effective, user-friendly, and more safe.

J.S. Held Subject Matter Experts Include
  • Accident Reconstruction Consultants
  • Certified Hazardous Materials Managers
  • Certified Industrial Hygienists
  • Certified Safety Professionals
  • Cognitive Psychologists
  • Computer Vision Scientists
  • Data Scientists
  • Developmental Psychologists
  • Environmental Scientists
  • Epidemiologists
  • Equipment Consultants
  • Food Forensics & Safety Experts
  • Forensic Engineers – Civil, Structural, Mechanical, Electrical, Geotechnical & Biomechanical
  • Forensic Meteorologists
  • Human Factors Psychologists
  • Infectious Disease Experts
  • Intellectual Property Experts
  • Kinesiologists
  • Metallurgists & Materials Scientists
  • Perception Scientists
  • Product Liability Experts
  • Professional Engineers
  • Regulatory Compliance Experts
  • Statisticians
  • Toxicologists
  • Transportation Psychologists
  • Workplace Safety Experts
Our Human Factors Consulting Services
  • Accident Reconstruction
  • Class Action Litigation Support
  • Compliance Consulting
  • Consumer Decision-Making Analysis
  • Data Collection & Analysis
  • Distracted or Inattentive Driving
  • Driver Gaze Analysis
  • Driver Safety
  • Equipment Consulting
  • Ergonomics Evaluations
  • Expert Witness & Litigation Support
  • Human Factors Failure Mode and Effects Analyses (HF FMEA)
  • Forensic Engineering
  • Human Factors Analysis
  • Motor Vehicle Accident Litigation Support
  • Perception-Reaction Time
  • Premises Liability Litigation Support
  • Process, Design, Ergonomics, Manufacturing & Performance Evaluation
  • Product Liability & Failure to Warn Litigation Support
  • Proposition 65 Litigation Support
  • Root Cause Analysis
  • Visibility and Conspicuity
Our UX Consulting Services
  • A/B Testing
  • Accessibility Assessment
  • Card Sorting
  • Cognitive Workload Assessment
  • Competitive Analysis & Benchmarking
  • Contextual Inquiry
  • Diary Studies
  • Ethnography
  • Eye Tracking
  • Focus Groups
  • Formative & Validation/Summative Medical Device Testing
  • Hardware, Software & User Interface (UI) Consulting
  • Health & Safety Risk Assessment
  • Instructions & Warnings Comprehension Testing & Design
  • Literature Reviews
  • Market & Pricing Research
  • MaxDiff Analyses
  • Meta Analyses
  • Motion Capture/IMUs
  • Heuristic Evaluations & Expert Reviews
  • Needs & Motivation Analysis
  • Participatory Design
  • Physiological Data Recording & Analysis (e.g., EEG, EMG, EKG)
  • PMA/510(k)/De Novo Regulatory Submission Support
  • Product Engineering Services
  • Product Stewardship & Liability Consulting
  • Pupillometry
  • Quantitative & Qualitative Research
  • Remote Testing
  • Risk Analysis & Risk Communication
  • Survey & Questionnaire Design & Analysis
  • Task Analyses
  • Time & Motion Studies
  • Tree Tests
  • Unmoderated User Testing
  • Usability Testing
  • User Journeys
  • Workflow Analyses

Expertise Across the Product & Services Development Lifecycle

We provide human factors and user experience support along the entire product lifecycle, from ideation to product retirement. Unlike other user experience agencies, we spend a significant amount of time on the post-product launch phase of the lifecycle, which allows us to leverage insights gained from product failures and product litigation into the earlier phases of the lifecycle.


Focus Group

Market Gap Analysis


Literature Review

Market & Pricing Research

Meta Analysis

Needs & Motivation Analysis

Failure Mode & Effects Analysis


Time & Motion Study

Workflow Analysis

User Journey

User Requirements Engineering

Use Environment

Contextual Inquiry


Participatory Design


Interaction Design Concepts

Risk Communication


Health & Safety Testing

Usability Testing

Accessibility Assessment

Cognitive Workload Assessment

Competitive Analysis & Benchmarking

Formative & Validation/Summative Medical Device Testing

Heuristic Evaluation & Expert Review


Operator Training


Review of Large-Scale Injury Databases (e.g., MAUDE, NEISS)


Product Recall Support

FDA Deficiency Letter Support

FDA CAPA Support

CPSC Letter of Advice Support

Expert Witness Services & Litigation Support

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