Skip to content

Learning Graph for Learning STEM with Raspberry Pi Hardware

Open Learning Graph Viewer Fullscreen

This section contains the learning graph for this textbook. A learning graph is a graph of concepts used in this textbook. Each concept is represented by a node in a network graph. Concepts are connected by directed edges that indicate what concepts each node depends on before that concept is understood by the student.

A learning graph is the foundational data structure for intelligent textbooks that can recommend learning paths. A learning graph is like a roadmap of concepts to help students arrive at their learning goals.

At the left of the learning graph are prerequisite or foundational concepts. They have no outbound edges. They only have inbound edges for other concepts that depend on understanding these foundational prerequisite concepts. At the far right we have the most advanced concepts in the course. To master these concepts you must understand all the concepts that they point to.

Because this course is an encyclopedia-style survey spanning five hardware tiers — Pico breadboard kits, Pico-based STEM robots, clocks and wearables, the Raspberry Pi 500+, and Raspberry Pi 5 with the AI HAT+ — the concept count was raised beyond the usual ~200 to 531 concepts, at the user's direction, so the graph is a complete inventory rather than a sampled subset.

Here are other files used by the learning graph.

Course Description

We use the Course Description as the source document for the concepts that are included in this course. The course description uses the 2001 Bloom taxonomy to order learning objectives.

List of Concepts

We use generative AI to convert the course description into a Concept List. Each concept is in the form of a short Title Case label with most labels under 32 characters long.

Concept Dependency List

We next use generative AI to create a Directed Acyclic Graph (DAG). DAGs do not have cycles where concepts depend on themselves. We provide the DAG in two formats. One is a CSV file and the other format is a JSON file that uses the vis-network JavaScript library format. The vis-network format uses nodes, edges and metadata elements with edges containing from and to properties. This makes it easy for you to view and edit the learning graph using an editor built with the vis-network tools.

Analysis & Documentation

Course Description Quality Assessment

This report rates the overall quality of the course description for the purpose of generating a learning graph.

  • Course description fields and content depth analysis
  • Validates course description has sufficient depth for generating 200+ concepts
  • Compares course description against similar courses
  • Identifies content gaps and strengths
  • Suggests areas of improvement

View the Course Description Quality Assessment — scored 100/100.

Learning Graph Quality Validation

This report gives you an overall assessment of the quality of the learning graph. It uses graph algorithms to look for specific quality patterns in the graph.

  • Graph structure validation - all 531 concepts are connected in a single component
  • DAG validation (0 cycles detected)
  • Foundational concepts: 5 entry points (Computational Thinking, Physical Computing, Raspberry Pi Foundation, Breadboard, Voltage)
  • Indegree distribution analysis
  • Longest dependency chain: 20 concepts, from Raspberry Pi Foundation to Alert Sound Trigger
  • Connectivity: 100% of nodes connected to the main cluster, 0 orphaned nodes

View the Learning Graph Quality Validation

Concept Taxonomy

In order to see patterns in the learning graph, it is useful to assign colors to each concept based on the concept type. We use generative AI to create about a dozen categories for our concepts and then place each concept into a single primary classifier.

  • A concept classifier taxonomy with 12 categories, aligned to the course's 5 hardware tiers
  • Category organization - foundational elements first, capstone project ideas last
  • Balanced categories (5.3% - 12.8% each)
  • All categories under the 30% threshold
  • Pedagogical flow recommendations
  • Clear 4-5 letter abbreviations for use in the CSV file
  • No Miscellaneous (MISC) category was needed — every concept fit a hardware-tier category

View the Concept Taxonomy

Taxonomy Distribution

This report shows how many concepts fit into each category of the taxonomy. Our goal is a somewhat balanced taxonomy where each category holds a roughly equal number of concepts. We also don't want any category to contain over 30% of our concepts.

  • Statistical breakdown
  • Detailed concept listing by category
  • Visual distribution table
  • Balance verification

View the Taxonomy Distribution Report

Graph Viewer

Explore the 531-concept, 722-edge graph visually with the interactive viewer below. Search, filter by category, and click any node to highlight its dependencies.