Interior Design Cheat Sheet 2026

The 30 highest-yield Interior Design facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What does the Color Rendering Index (CRI) measure? → How accurately a light source renders colors compared to natural light
2. According to Illuminating Engineering Society (IES) guidelines, what is the recommended illuminance range for general office work areas? → 30–50 foot-candles
3. What is the benefit of interdisciplinary collaboration in Interior Design practice? → It brings diverse expertise and perspectives that improve outcomes and innovation
4. What is the purpose of a fluorescent fixture's ballast? → To start voltage and operate current
5. Which tile installation pattern uses rectangular tiles arranged so the joints of one row align with the center of tiles in adjacent rows? → Running bond/brick
6. Which approach best demonstrates professional competency in Interior Design practice? → Integrating continuing education, practical experience, and evidence-based decision making
7. Which metal finish applied to fixtures and hardware is most resistant to tarnishing, fingerprints, and everyday wear in kitchen and bath applications? → Brushed nickel
8. What does the term 'net square footage' refer to in space planning? → Usable interior floor area excluding walls and structural elements
9. How do Interior Design professionals transfer knowledge from training to practice? → Through supervised practice, mentoring, gradual independence, and ongoing feedback
10. Which paint finish is most appropriate for high-traffic areas such as hallways, kitchens, and trim due to its durability and cleanability? → Semi-gloss
11. How should an Interior Design professional respond to a compliance violation? → Report it promptly, investigate the root cause, and implement corrective actions
12. Please tick the term that represents a horizontal part that is placed over a huge aperture to support the weight above in the construction of a wall: → Lintel
13. According to standard ergonomic guidelines, what is the recommended seat height range for a dining chair paired with a standard 30-inch dining table? → 17–19 inches
14. In open-plan residential design, which technique is most commonly used to define separate functional zones without building walls? → Using area rugs, furniture arrangement, and lighting zones
15. The standard counter height for kitchen work surfaces in US residential design is: → 36 inches
16. What is the name of a document that is typically completed at the conclusion of a project and identifies defects that the contractor must address? → Punch list
17. What is the purpose of regular risk reviews in Interior Design practice? → To identify new risks, evaluate control effectiveness, and update mitigation strategies
18. How do Interior Design professionals evaluate research quality? → By assessing methodology, sample size, peer review status, and relevance to practice
19. Which tool is commonly used for root cause analysis in Interior Design quality management? → Fishbone (Ishikawa) diagram to identify contributing factors systematically
20. Which countertop material is non-porous, heat-resistant, and composed of natural quartz crystals bound with resin? → Engineered quartz
21. Which design movement, originating in early 20th-century Germany, emphasized the unity of fine art, craft, and technology? → Bauhaus
22. When a concrete slab is supported directly by the ground, what is the least thickness that can be used? → 4 inches
23. Why is documentation important in Interior Design risk management? → It creates an audit trail, supports decision-making, and demonstrates due diligence
24. Please tick the term that best represents the circumstance when a bank project incurs more expenses than anticipated: → Cost overrun
25. What is the benefit of standardized digital reporting in Interior Design practice? → It ensures consistency, enables comparison, and facilitates regulatory compliance
26. What does the spacing criterion (SC) help determine in a lighting layout? → The maximum spacing between luminaires relative to their mounting height
27. Please mark one of the following options as open grain hardwood: → Walnut
28. The ornate, highly decorative French style featuring gold leaf, asymmetrical curves, and pastel colors is known as: → Rococo
29. Please tick the word that best describes the vertical members that hold the header in place during construction: → Jack Studs
30. What is reflective practice in Interior Design professional development? → Systematically examining experiences to gain insight and improve future practice