FAQ Coverage Gaps

Concepts from the 293-concept learning graph that are not named by exact text match in any FAQ question or answer in docs/faq.md. 78 of 293 concepts (26.6%) fall into this list.

Critical Gaps (High Priority)

High-centrality concepts (2+ dependent concepts) without FAQ coverage: none. A supplemental gap-fill generation pass explicitly targeted every concept with 2 or more dependents, so all remaining gaps below are lower-centrality (1 dependent or leaf) concepts.

Medium Priority Gaps

Moderate-centrality concepts (1 dependent concept) without FAQ coverage:

Medium priority (24 concepts)

• Tired Expression
• Centrality: 1 dependent concept
• Category: Emotion Psychology & Expression Design
• Covering chapter: chapters/10-emotion-theory-core-expressions/index.md

• Suggested question: "What is Tired Expression, and where does it fit in this course?"

• Confused Expression

• Centrality: 1 dependent concept
• Category: Emotion Psychology & Expression Design
• Covering chapter: chapters/10-emotion-theory-core-expressions/index.md

• Suggested question: "What is Confused Expression, and where does it fit in this course?"

• Eyebrow Emotion Signaling

• Centrality: 1 dependent concept
• Category: Emotion Psychology & Expression Design
• Covering chapter: chapters/11-expression-design-readability-hri/index.md

• Suggested question: "What is Eyebrow Emotion Signaling, and where does it fit in this course?"

• Mouth Emotion Signaling

• Centrality: 1 dependent concept
• Category: Emotion Psychology & Expression Design
• Covering chapter: chapters/11-expression-design-readability-hri/index.md

• Suggested question: "What is Mouth Emotion Signaling, and where does it fit in this course?"

• Eye Emotion Signaling

• Centrality: 1 dependent concept
• Category: Emotion Psychology & Expression Design
• Covering chapter: chapters/11-expression-design-readability-hri/index.md

• Suggested question: "What is Eye Emotion Signaling, and where does it fit in this course?"

• Anthropomorphism

• Centrality: 1 dependent concept
• Category: Emotion Psychology & Expression Design
• Covering chapter: chapters/11-expression-design-readability-hri/index.md

• Suggested question: "What is Anthropomorphism, and where does it fit in this course?"

• Multimodal Emotion Cues

• Centrality: 1 dependent concept
• Category: Emotion Psychology & Expression Design
• Covering chapter: chapters/11-expression-design-readability-hri/index.md

• Suggested question: "What is Multimodal Emotion Cues, and where does it fit in this course?"

• Pupil Movement Gaze

• Centrality: 1 dependent concept
• Category: Animation & Timing
• Covering chapter: chapters/12-animating-expressions/index.md

• Suggested question: "What is Pupil Movement Gaze, and where does it fit in this course?"

• Easing Function

• Centrality: 1 dependent concept
• Category: Animation & Timing
• Covering chapter: chapters/12-animating-expressions/index.md

• Suggested question: "What is Easing Function, and where does it fit in this course?"

• Frame Buffer Redraw Rate

• Centrality: 1 dependent concept
• Category: Animation & Timing
• Covering chapter: chapters/12-animating-expressions/index.md

• Suggested question: "What is Frame Buffer Redraw Rate, and where does it fit in this course?"

• Flicker Reduction

• Centrality: 1 dependent concept
• Category: Animation & Timing
• Covering chapter: chapters/12-animating-expressions/index.md

• Suggested question: "What is Flicker Reduction, and where does it fit in this course?"

• Rotary Encoder Position Tracking

• Centrality: 1 dependent concept
• Category: Interactive Controls & State Machines
• Covering chapter: chapters/14-expression-menu-live-controls/index.md

• Suggested question: "What is Rotary Encoder Position Tracking, and where does it fit in this course?"

• Encoder Direction Detection

• Centrality: 1 dependent concept
• Category: Interactive Controls & State Machines
• Covering chapter: chapters/14-expression-menu-live-controls/index.md

• Suggested question: "What is Encoder Direction Detection, and where does it fit in this course?"

• Live Parameter Tuning

• Centrality: 1 dependent concept
• Category: Interactive Controls & State Machines
• Covering chapter: chapters/14-expression-menu-live-controls/index.md

• Suggested question: "What is Live Parameter Tuning, and where does it fit in this course?"

• Event-Driven Programming

• Centrality: 1 dependent concept
• Category: Interactive Controls & State Machines
• Covering chapter: chapters/13-interactive-controls-inputs/index.md

• Suggested question: "What is Event-Driven Programming, and where does it fit in this course?"

• State Transition Diagram

• Centrality: 1 dependent concept
• Category: Interactive Controls & State Machines
• Covering chapter: chapters/13-interactive-controls-inputs/index.md

• Suggested question: "What is State Transition Diagram, and where does it fit in this course?"

• Encoder Quadrature Signal

• Centrality: 1 dependent concept
• Category: Interactive Controls & State Machines
• Covering chapter: chapters/14-expression-menu-live-controls/index.md

• Suggested question: "What is Encoder Quadrature Signal, and where does it fit in this course?"

• Red Green Blue Channels

• Centrality: 1 dependent concept
• Category: Color Display & RGB565 Porting
• Covering chapter: chapters/15-porting-faces-color-display/index.md

• Suggested question: "What is Red Green Blue Channels, and where does it fit in this course?"

• Color Wheel Function

• Centrality: 1 dependent concept
• Category: Color Display & RGB565 Porting
• Covering chapter: chapters/15-porting-faces-color-display/index.md

• Suggested question: "What is Color Wheel Function, and where does it fit in this course?"

• Display Driver Porting

• Centrality: 1 dependent concept
• Category: Color Display & RGB565 Porting
• Covering chapter: chapters/15-porting-faces-color-display/index.md

• Suggested question: "What is Display Driver Porting, and where does it fit in this course?"

• Display Performance Comparison

• Centrality: 1 dependent concept
• Category: Color Display & RGB565 Porting
• Covering chapter: chapters/15-porting-faces-color-display/index.md

• Suggested question: "What is Display Performance Comparison, and where does it fit in this course?"

• Software Display Emulator

• Centrality: 1 dependent concept
• Category: Computational Thinking & Capstone Design
• Covering chapter: chapters/16-computational-thinking-capstone/index.md

• Suggested question: "What is Software Display Emulator, and where does it fit in this course?"

• Constraint-Driven Design

• Centrality: 1 dependent concept
• Category: Computational Thinking & Capstone Design
• Covering chapter: chapters/16-computational-thinking-capstone/index.md

• Suggested question: "What is Constraint-Driven Design, and where does it fit in this course?"

• Minimum Viable Feature Set

• Centrality: 1 dependent concept
• Category: Computational Thinking & Capstone Design
• Covering chapter: chapters/16-computational-thinking-capstone/index.md
• Suggested question: "What is Minimum Viable Feature Set, and where does it fit in this course?"

Low Priority Gaps

Leaf concepts (0 dependents) without FAQ coverage — typically fine-grained details or terminal/specialized topics:

Low priority (54 concepts)

• Cytron Maker Pi RP2040
• Centrality: 0 dependent concepts
• Category: Hardware & Electronics Foundations
• Covering chapter: chapters/01-hardware-electronics-foundations/index.md

• Suggested question: "What is Cytron Maker Pi RP2040, and where does it fit in this course?"

• Data Command Pin

• Centrality: 0 dependent concepts
• Category: Hardware & Electronics Foundations
• Covering chapter: chapters/01-hardware-electronics-foundations/index.md

• Suggested question: "What is Data Command Pin, and where does it fit in this course?"

• Breadboard Wiring Diagram

• Centrality: 0 dependent concepts
• Category: Hardware & Electronics Foundations
• Covering chapter: chapters/01-hardware-electronics-foundations/index.md

• Suggested question: "What is Breadboard Wiring Diagram, and where does it fit in this course?"

• Display Power Requirements

• Centrality: 0 dependent concepts
• Category: Hardware & Electronics Foundations
• Covering chapter: chapters/01-hardware-electronics-foundations/index.md

• Suggested question: "What is Display Power Requirements, and where does it fit in this course?"

• Display Mounting Considerations

• Centrality: 0 dependent concepts
• Category: Hardware & Electronics Foundations
• Covering chapter: chapters/01-hardware-electronics-foundations/index.md

• Suggested question: "What is Display Mounting Considerations, and where does it fit in this course?"

• Robot Face Design Scoping

• Centrality: 0 dependent concepts
• Category: History Of Screen-Based Robot Faces
• Covering chapter: chapters/02-history-of-robot-faces/index.md

• Suggested question: "What is Robot Face Design Scoping, and where does it fit in this course?"

• Robot Voice Interaction

• Centrality: 0 dependent concepts
• Category: History Of Screen-Based Robot Faces
• Covering chapter: chapters/02-history-of-robot-faces/index.md

• Suggested question: "What is Robot Voice Interaction, and where does it fit in this course?"

• Robot Business Case Study

• Centrality: 0 dependent concepts
• Category: History Of Screen-Based Robot Faces
• Covering chapter: chapters/02-history-of-robot-faces/index.md

• Suggested question: "What is Robot Business Case Study, and where does it fit in this course?"

• Anki Company History

• Centrality: 0 dependent concepts
• Category: History Of Screen-Based Robot Faces
• Covering chapter: chapters/02-history-of-robot-faces/index.md

• Suggested question: "What is Anki Company History, and where does it fit in this course?"

• Robot Personality Branding

• Centrality: 0 dependent concepts
• Category: History Of Screen-Based Robot Faces
• Covering chapter: chapters/02-history-of-robot-faces/index.md

• Suggested question: "What is Robot Personality Branding, and where does it fit in this course?"

• Screen As Face Metaphor

• Centrality: 0 dependent concepts
• Category: History Of Screen-Based Robot Faces
• Covering chapter: chapters/02-history-of-robot-faces/index.md

• Suggested question: "What is Screen As Face Metaphor, and where does it fit in this course?"

• Educational Robotics Market

• Centrality: 0 dependent concepts
• Category: History Of Screen-Based Robot Faces
• Covering chapter: chapters/02-history-of-robot-faces/index.md

• Suggested question: "What is Educational Robotics Market, and where does it fit in this course?"

• String Formatting

• Centrality: 0 dependent concepts
• Category: MicroPython Programming Fundamentals
• Covering chapter: chapters/04-micropython-fundamentals-2/index.md

• Suggested question: "What is String Formatting, and where does it fit in this course?"

• Multiple Return Values

• Centrality: 0 dependent concepts
• Category: MicroPython Programming Fundamentals
• Covering chapter: chapters/04-micropython-fundamentals-2/index.md

• Suggested question: "What is Multiple Return Values, and where does it fit in this course?"

• Drawing Constants

• Centrality: 0 dependent concepts
• Category: Basic Drawing Primitives
• Covering chapter: chapters/06-basic-drawing-primitives/index.md

• Suggested question: "What is Drawing Constants, and where does it fit in this course?"

• Text Method

• Centrality: 0 dependent concepts
• Category: Basic Drawing Primitives
• Covering chapter: chapters/06-basic-drawing-primitives/index.md

• Suggested question: "What is Text Method, and where does it fit in this course?"

• Clipping At Screen Edge

• Centrality: 0 dependent concepts
• Category: Basic Drawing Primitives
• Covering chapter: chapters/06-basic-drawing-primitives/index.md

• Suggested question: "What is Clipping At Screen Edge, and where does it fit in this course?"

• Circle As Special Ellipse

• Centrality: 0 dependent concepts
• Category: Ellipse & Polygon Drawing
• Covering chapter: chapters/07-ellipse-polygon-drawing/index.md

• Suggested question: "What is Circle As Special Ellipse, and where does it fit in this course?"

• Rounded Rectangle Approximation

• Centrality: 0 dependent concepts
• Category: Ellipse & Polygon Drawing
• Covering chapter: chapters/07-ellipse-polygon-drawing/index.md

• Suggested question: "What is Rounded Rectangle Approximation, and where does it fit in this course?"

• Blit Cross-Format Support V1.17

• Centrality: 0 dependent concepts
• Category: MicroPython FrameBuf Version History
• Covering chapter: chapters/08-framebuf-version-history/index.md

• Suggested question: "What is Blit Cross-Format Support V1.17, and where does it fit in this course?"

• Pre-2023 Curve Workaround

• Centrality: 0 dependent concepts
• Category: MicroPython FrameBuf Version History
• Covering chapter: chapters/08-framebuf-version-history/index.md

• Suggested question: "What is Pre-2023 Curve Workaround, and where does it fit in this course?"

• MicroPython Firmware Update

• Centrality: 0 dependent concepts
• Category: MicroPython FrameBuf Version History
• Covering chapter: chapters/08-framebuf-version-history/index.md

• Suggested question: "What is MicroPython Firmware Update, and where does it fit in this course?"

• Open Source Contribution Model

• Centrality: 0 dependent concepts
• Category: MicroPython FrameBuf Version History
• Covering chapter: chapters/08-framebuf-version-history/index.md

• Suggested question: "What is Open Source Contribution Model, and where does it fit in this course?"

• Eye Spacing

• Centrality: 0 dependent concepts
• Category: Facial Anatomy & Layout
• Covering chapter: chapters/09-facial-anatomy-layout-design/index.md

• Suggested question: "What is Eye Spacing, and where does it fit in this course?"

• Pupil Size Parameter

• Centrality: 0 dependent concepts
• Category: Facial Anatomy & Layout
• Covering chapter: chapters/09-facial-anatomy-layout-design/index.md

• Suggested question: "What is Pupil Size Parameter, and where does it fit in this course?"

• Nose Representation

• Centrality: 0 dependent concepts
• Category: Facial Anatomy & Layout
• Covering chapter: chapters/09-facial-anatomy-layout-design/index.md

• Suggested question: "What is Nose Representation, and where does it fit in this course?"

• Facial Proportion

• Centrality: 0 dependent concepts
• Category: Facial Anatomy & Layout
• Covering chapter: chapters/09-facial-anatomy-layout-design/index.md

• Suggested question: "What is Facial Proportion, and where does it fit in this course?"

• Feature Independence

• Centrality: 0 dependent concepts
• Category: Facial Anatomy & Layout
• Covering chapter: chapters/09-facial-anatomy-layout-design/index.md

• Suggested question: "What is Feature Independence, and where does it fit in this course?"

• Cheek Representation

• Centrality: 0 dependent concepts
• Category: Facial Anatomy & Layout
• Covering chapter: chapters/09-facial-anatomy-layout-design/index.md

• Suggested question: "What is Cheek Representation, and where does it fit in this course?"

• Face State Data Structure

• Centrality: 0 dependent concepts
• Category: Facial Anatomy & Layout
• Covering chapter: chapters/09-facial-anatomy-layout-design/index.md

• Suggested question: "What is Face State Data Structure, and where does it fit in this course?"

• Feature Scaling For Screen Size

• Centrality: 0 dependent concepts
• Category: Facial Anatomy & Layout
• Covering chapter: chapters/09-facial-anatomy-layout-design/index.md

• Suggested question: "What is Feature Scaling For Screen Size, and where does it fit in this course?"

• Contempt Expression

• Centrality: 0 dependent concepts
• Category: Emotion Psychology & Expression Design
• Covering chapter: chapters/10-emotion-theory-core-expressions/index.md

• Suggested question: "What is Contempt Expression, and where does it fit in this course?"

• Stern Expression

• Centrality: 0 dependent concepts
• Category: Emotion Psychology & Expression Design
• Covering chapter: chapters/10-emotion-theory-core-expressions/index.md

• Suggested question: "What is Stern Expression, and where does it fit in this course?"

• Cross-Cultural Recognition

• Centrality: 0 dependent concepts
• Category: Emotion Psychology & Expression Design
• Covering chapter: chapters/11-expression-design-readability-hri/index.md

• Suggested question: "What is Cross-Cultural Recognition, and where does it fit in this course?"

• Uncanny Valley Effect

• Centrality: 0 dependent concepts
• Category: Emotion Psychology & Expression Design
• Covering chapter: chapters/11-expression-design-readability-hri/index.md

• Suggested question: "What is Uncanny Valley Effect, and where does it fit in this course?"

• Affective Computing

• Centrality: 0 dependent concepts
• Category: Emotion Psychology & Expression Design
• Covering chapter: chapters/11-expression-design-readability-hri/index.md

• Suggested question: "What is Affective Computing, and where does it fit in this course?"

• Eye Scanner Animation

• Centrality: 0 dependent concepts
• Category: Animation & Timing
• Covering chapter: chapters/12-animating-expressions/index.md

• Suggested question: "What is Eye Scanner Animation, and where does it fit in this course?"

• Double Buffering

• Centrality: 0 dependent concepts
• Category: Animation & Timing
• Covering chapter: chapters/12-animating-expressions/index.md

• Suggested question: "What is Double Buffering, and where does it fit in this course?"

• Animation Keyframe

• Centrality: 0 dependent concepts
• Category: Animation & Timing
• Covering chapter: chapters/12-animating-expressions/index.md

• Suggested question: "What is Animation Keyframe, and where does it fit in this course?"

• Smooth Transition Design

• Centrality: 0 dependent concepts
• Category: Animation & Timing
• Covering chapter: chapters/12-animating-expressions/index.md

• Suggested question: "What is Smooth Transition Design, and where does it fit in this course?"

• State-Based Animation Trigger

• Centrality: 0 dependent concepts
• Category: Animation & Timing
• Covering chapter: chapters/14-expression-menu-live-controls/index.md

• Suggested question: "What is State-Based Animation Trigger, and where does it fit in this course?"

• Multi-Mode Menu

• Centrality: 0 dependent concepts
• Category: Interactive Controls & State Machines
• Covering chapter: chapters/14-expression-menu-live-controls/index.md

• Suggested question: "What is Multi-Mode Menu, and where does it fit in this course?"

• Input Debouncing Delay

• Centrality: 0 dependent concepts
• Category: Interactive Controls & State Machines
• Covering chapter: chapters/14-expression-menu-live-controls/index.md

• Suggested question: "What is Input Debouncing Delay, and where does it fit in this course?"

• Color Bit Depth

• Centrality: 0 dependent concepts
• Category: Color Display & RGB565 Porting
• Covering chapter: chapters/15-porting-faces-color-display/index.md

• Suggested question: "What is Color Bit Depth, and where does it fit in this course?"

• Color Palette

• Centrality: 0 dependent concepts
• Category: Color Display & RGB565 Porting
• Covering chapter: chapters/15-porting-faces-color-display/index.md

• Suggested question: "What is Color Palette, and where does it fit in this course?"

• Color Contrast Design

• Centrality: 0 dependent concepts
• Category: Color Display & RGB565 Porting
• Covering chapter: chapters/15-porting-faces-color-display/index.md

• Suggested question: "What is Color Contrast Design, and where does it fit in this course?"

• Hue Saturation Brightness

• Centrality: 0 dependent concepts
• Category: Color Display & RGB565 Porting
• Covering chapter: chapters/15-porting-faces-color-display/index.md

• Suggested question: "What is Hue Saturation Brightness, and where does it fit in this course?"

• Algorithm Design

• Centrality: 0 dependent concepts
• Category: Computational Thinking & Capstone Design
• Covering chapter: chapters/16-computational-thinking-capstone/index.md

• Suggested question: "What is Algorithm Design, and where does it fit in this course?"

• Turtle Graphics Prototype

• Centrality: 0 dependent concepts
• Category: Computational Thinking & Capstone Design
• Covering chapter: chapters/16-computational-thinking-capstone/index.md

• Suggested question: "What is Turtle Graphics Prototype, and where does it fit in this course?"

• Iterative Design Process

• Centrality: 0 dependent concepts
• Category: Computational Thinking & Capstone Design
• Covering chapter: chapters/16-computational-thinking-capstone/index.md

• Suggested question: "What is Iterative Design Process, and where does it fit in this course?"

• Rubric-Based Assessment

• Centrality: 0 dependent concepts
• Category: Computational Thinking & Capstone Design
• Covering chapter: chapters/16-computational-thinking-capstone/index.md

• Suggested question: "What is Rubric-Based Assessment, and where does it fit in this course?"

• Capstone Demonstration

• Centrality: 0 dependent concepts
• Category: Computational Thinking & Capstone Design
• Covering chapter: chapters/16-computational-thinking-capstone/index.md

• Suggested question: "What is Capstone Demonstration, and where does it fit in this course?"

• Project Documentation

• Centrality: 0 dependent concepts
• Category: Computational Thinking & Capstone Design
• Covering chapter: chapters/16-computational-thinking-capstone/index.md

• Suggested question: "What is Project Documentation, and where does it fit in this course?"

• Design Justification

• Centrality: 0 dependent concepts
• Category: Computational Thinking & Capstone Design
• Covering chapter: chapters/16-computational-thinking-capstone/index.md
• Suggested question: "What is Design Justification, and where does it fit in this course?"

Recommendations

1. No critical (high-centrality) gaps remain — the 2026-08-02 gap-fill pass covered every concept with 2 or more dependents.
2. The 24 medium-priority gaps (1 dependent each) are good candidates for the next content refresh.
3. The 54 low-priority leaf concepts can be addressed opportunistically or left to the glossary, which already defines all 293 concepts.