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IDFX · FundamentalsPublished

Interior Design Fundamentals

The Interior Design Fundamentals Exam assesses foundational knowledge used early in a project: understanding existing conditions, pre-design activity, programming, space planning, preliminary furniture, fixtures, equipment and finishes, and schematic design.

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Content areas and weightings follow the CIDQ Interior Design Fundamentals Exam blueprint effective 2026 and forward. Confirm the current blueprint on cidq.org before you sit the examination.

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Exam focus

  • Existing Conditions — 14% of the examination
  • Pre-Design — 15%
  • Programming — 16%
  • Space Planning — 19%
  • Preliminary FF&E and Finishes — 16%
  • Schematics — 20%

Interior Prep Studio is an independent study provider. It is not affiliated with, endorsed by, or licensed by CIDQ. Content areas and weightings are published by CIDQ and may be revised; always confirm the current blueprint before you sit the examination.

Interior Prep Studio material is authored and reviewed by K. Smith, licensed engineer, and E. Smith, licensed architect. Authors and reviewers

IDFX sample lessonIDFX sample questions

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82 published lessons8 modules across 7 content areas.
9 full-length timed exams934 practice questions and 1035 timed-exam questions — 1969 study questions in total.
Study Readiness by content areaStudy Readiness by content area, updated as you practise.

Curriculum preview

How published lessons map to the blueprint.

Each content area below shows its blueprint weighting alongside the lessons that are published and available to study today. Lessons still in draft or under subject-matter review are not listed.

Existing Conditions

14%

10 published lessons

  • Existing building evaluation
  • Construction types and assembly evidence
  • Critical interior constraints and coordination
  • Occupancy classifications and changes of use
  • Hazardous-material awareness and safe investigation
  • Site, context, orientation and access
  • Initial code analysis and a defensible code matrix
  • Occupant load and area-basis calculations
  • Life-safety fundamentals and the path to the outside
  • Existing-condition synthesis: a feasibility decision

Pre-Design

15%

10 published lessons

  • Client goals, visioning and useful questions
  • Project objectives and testable design intent
  • Stakeholder needs and market-sector differences
  • Design standards, elements and principles
  • Brand standards and color as a design tool
  • Evidence-based design and research quality
  • Universal design and an inclusive arrival experience
  • Sustainability, wellness and substantiated claims
  • Context, market analysis and precedent selection
  • Pre-design synthesis: choosing a defensible direction

Programming

16%

10 published lessons

  • The programming process and the problem statement
  • User requirements, human factors and fit
  • Interviews, surveys and observation plans
  • Functional requirements and activity sequences
  • Adjacencies, separation and relationship strength
  • Space requirements, net-to-gross and program totals
  • Occupancy, capacity and time-dependent demand
  • Equipment, services and special user requirements
  • Program documents and diagram selection
  • Program evaluation and sensory requirements

Space Planning

19%

14 published lessons

  • From adjacency requirements to a spatial diagram
  • Bubble diagrams, parti and early alternatives
  • Circulation as a working system
  • Accessible routes and continuous usable connections
  • Egress concepts applied to a floor plan
  • Furniture clearances and complete operating footprints
  • Anthropometrics, reach and dimensional reasoning
  • Universal design in an actual test fit
  • Occupancy relationships, privacy and spatial zoning
  • Space allocation and the first scaled test fit
  • Planning efficiency without sacrificing function
  • Blocking and stacking within a real building
  • Reading and evaluating preliminary drawings
  • Hotspot and plan-review problem-solving

Preliminary FF&E and Finishes

16%

12 published lessons

  • Furniture selection starts with the activity
  • Furniture performance and the complete product
  • Textile construction, direction and performance vocabulary
  • Finish materials as installed systems
  • Durability and the difference between a test and service life
  • Maintenance, cleaning and the operating reality
  • Sustainability claims, reuse and the life-cycle question
  • Flammability, assembly evidence and health-safety screening
  • Slip resistance and the conditions of use
  • Indoor environmental quality and material exposure
  • Material selection through a requirements matrix
  • Preliminary specifications, scope and procurement feasibility

Schematics

20%

15 published lessons

  • Schematic design as an integrated decision stage
  • Refining a concept without losing its purpose
  • Preliminary plans and the information they must carry
  • Furniture layouts as occupied and changing arrangements
  • Lighting concepts: task, distribution and color
  • Ceiling concepts and the space above the plan
  • Finish concepts as a coherent spatial system
  • Wayfinding through decisions, landmarks and redundancy
  • Building-system awareness and responsible coordination
  • Comparing alternatives with a consistent decision basis
  • Code review during schematic development
  • Visualizations that communicate without misleading
  • Client review, feedback and the meaning of approval
  • Refinement, quality checks and a controlled handoff
  • Integrated schematic case: the learning hub decision

Course orientation and preparation

—%

11 published lessons

  • Understanding IDFX and the course
  • Exam interface, question types and time management
  • Using codes and references without mixing editions
  • The health, safety and welfare decision filter
  • Taking the diagnostic and interpreting the result
  • Building a realistic study calendar
  • The wrong-answer journal and responsible AI tutoring
  • Turning the diagnostic into a targeted review plan
  • Timed practice and the full mock-exam routine
  • Study Readiness, evidence limits and final weak-area recovery
  • Exam-day preparation and the final reference check

Weightings shown are the content-area weightings published in the current CIDQ blueprint for this examination. All study content is written in-house and is released only after the owner records a content confirmation. Anything not yet confirmed stays unpublished.

Study Readiness is an internal study-planning metric calculated from your activity and practice accuracy on this platform. It is not a CIDQ score, not a validated pass probability, and not a prediction of your exam result.

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Interior Prep Studio material is authored and reviewed by K. Smith, licensed engineer, and E. Smith, licensed architect. Authors and reviewers

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