Comprehensive review for all three exam sections The Interior Design Reference Manual by David Ballast covers all three sections of the NCIDQ exams which include the fundamentals (IDFX), professional (IDPX), and practicum (PRAC) sections. Pass your exams the first time with comprehensive reading materials on all topics. The NCIDQ Interior Design Reference Manual features Interior Design Topics Covered Paperback About the PPI, A Kaplan Company has been trusted by engineering exam candidates since 1975.