Understanding AI Hallucinations Course

Lesson 1 • Types of Hallucinations

Hallucinations vary by content type and severity. Classifying them enables targeted detection and mitigation strategies later in the course.

Lesson 2 • How Language Models Generate Text

Token prediction mechanics explain why hallucinations emerge naturally. Understanding generation logic is prerequisite to diagnosing hallucination causes.

Lesson 3 • Hallucinations vs. Other AI Failures

Hallucinations differ from bias, misunderstanding, and refusal errors. Precise categorisation prevents misdiagnosis during real-world evaluation.

Lesson 1 • Training Data Limitations

Model outputs reflect gaps, noise, and imbalances in training corpora. Recognising data-level causes links training decisions to hallucination risk.

Lesson 2 • Model Architecture Factors

Attention mechanisms and parameter constraints shape what models can reliably recall. Architecture awareness helps learners anticipate systematic failure modes.

Lesson 3 • Prompt and Input Triggers

Certain prompt structures reliably increase hallucination rates. Identifying input-side triggers prepares learners for prompt engineering covered in later chapters.

Lesson 4 • Confidence Calibration Failures

Models often express high certainty regardless of actual accuracy. Miscalibration is a core cause of user over-trust and downstream harm.

Lesson 1 • Fact-Checking Workflows

Structured verification processes reduce missed hallucinations in professional outputs. Learners build repeatable workflows applicable across domains.

Lesson 2 • Automated Detection Tools

AI-assisted detection tools accelerate review at scale. Learners evaluate tool capabilities and limitations to avoid false confidence in automation.

Lesson 3 • Human Detection Heuristics

Trained readers spot hallucinations through linguistic and logical cues. These heuristics form the baseline before automated tools are introduced.

Lesson 4 • Citation and Reference Auditing

Fabricated citations are among the most damaging hallucination types. Systematic auditing catches invented references before they reach stakeholders.

Lesson 1 • Iterative Prompt Refinement

Systematic prompt testing and revision reduces hallucination rates over time. Learners apply a structured refinement loop to real prompt-output pairs.

Lesson 2 • Chain-of-Thought and Reasoning Prompts

Eliciting step-by-step reasoning exposes logical gaps before they become hallucinations. Learners practise structuring prompts that surface model reasoning.

Lesson 3 • Principles of Hallucination-Resistant Prompts

Effective prompts reduce ambiguity and anchor the model to verifiable content. These principles underpin all specific techniques taught in this chapter.

Lesson 4 • Retrieval-Augmented Generation Prompting

Supplying retrieved documents within prompts grounds model responses in real sources. RAG prompting is the most effective single technique for factual tasks.

Lesson 1 • RAG Architecture Fundamentals

RAG combines retrieval systems with generative models to ground outputs in documents. Understanding the full pipeline is prerequisite to optimisation.

Lesson 2 • RAG Failure Modes and Fixes

RAG systems fail in predictable ways including context overflow and retrieval drift. Diagnosing and fixing these failures is a core practitioner skill.

Lesson 3 • Retrieval Quality and Its Impact

Poor retrieval is the leading cause of RAG hallucinations. Learners diagnose retrieval failures and apply ranking and filtering improvements.

Lesson 4 • Grounding and Attribution in RAG

Grounded responses cite specific retrieved passages, enabling verification. Attribution mechanisms are essential for trust in high-stakes RAG deployments.

Lesson 1 • Metrics and Continuous Improvement

Quantitative hallucination metrics enable ongoing process improvement. Learners select and track KPIs that reflect real-world accuracy outcomes.

Lesson 2 • Incident Logging and Root Cause Analysis

Tracking hallucination incidents creates data for systemic improvement. Root cause analysis converts incidents into actionable process changes.

Lesson 3 • Training Staff on Hallucination Risks

Workforce awareness is a critical control layer alongside technical mitigations. Learners design role-specific training programmes for their organisations.

Lesson 4 • AI Output Policies and Standards

Written policies define acceptable AI use and verification requirements by task type. Clear standards reduce inconsistent handling across teams.

Lesson 1 • Benchmarks for Factual Accuracy

Standardised benchmarks measure model truthfulness across knowledge domains. Learners interpret benchmark results to compare models objectively.

Lesson 2 • Vendor and Model Selection Criteria

Procurement decisions must weigh hallucination risk alongside capability and cost. Learners build structured scorecards for AI vendor evaluation.

Lesson 3 • Post-Deployment Monitoring

Hallucination rates shift as models update and use cases evolve. Continuous monitoring detects degradation before it affects users at scale.

Lesson 4 • Designing Custom Evaluation Sets

Off-the-shelf benchmarks rarely match organisational use cases precisely. Custom evaluation sets test models on tasks and domains that matter most.

Lesson 1 • Regulatory Landscape for AI Accuracy

Emerging AI regulations increasingly address accuracy and transparency requirements. Learners map regulatory trends to organisational compliance planning.

Lesson 2 • Building a Responsible AI Culture

Sustainable hallucination control requires cultural norms, not just technical controls. Leaders embed accuracy values into team practices and incentive structures.

Lesson 3 • Communicating Hallucination Risk to Stakeholders

Leaders must translate technical risk into language executives and boards understand. Clear communication enables informed governance decisions.

Lesson 4 • Ethical Obligations Around AI Accuracy

Deploying systems known to hallucinate raises ethical duties of care. Learners apply ethical frameworks to real deployment decisions.