CDDN study guide
CDDN · Work through your exam, one topic at a time.
The Certified Developmental Disabilities Nurse credential is issued by the Developmental Disabilities Nurses Association (DDNA) to nurses who specialize in intellectual and developmental disabilities (IDD) nursing. Two parallel tracks exist: registered nurses earn the "RN, CDDN" designation, while licensed practical and licensed vocational nurses earn "LPN, DDC" or "LVN, DDC." Only nurses certified by DDNA may use these titles. The CDDN study guide has 12 sections and about 5,126 words.
01Staff education/training
This domain tests whether you can build and verify competence in the direct support workforce rather than simply deliver inservice sessions. In developmental disability services most hands-on health care is carried out by unlicensed staff acting on nursing direction, so the nurse owns both the teaching and the verification of that teaching.
441 words, about 2 min02Direct care
Direct care questions test clinical judgment at the point of care: recognizing change early, adapting technique to the person, and refusing to accept "that's just how she is" as an explanation for a new symptom. The person with an intellectual or developmental disability often presents illness atypically, and the exam rewards nurses who look past the disability.
402 words, about 2 min03Supervision of staff
This domain tests the nurse's supervisory and delegation judgment: what may be handed to unlicensed personnel, how competence is confirmed, and how performance problems are corrected without punishing the person receiving services. The state nurse practice act is always the controlling authority.
423 words, about 2 min04Assessment
Assessment questions test whether you can gather valid data from a person whose communication, cooperation, and history differ from the general population - and whether you can recognize an incomplete assessment. The exam favors systematic, baseline-anchored, multi-source assessment over one-time impression.
421 words, about 2 min05Individualized Service or Education Plans (ISPs or IEPs)
This domain tests your ability to contribute health content to a person-centered plan and to write objectives that are measurable, legally defensible, and genuinely about the person's life rather than about staff tasks. An ISP (adult services) or IEP (school, under IDEA) is built from the person's stated goals and preferences, assessed needs, and identified supports.
449 words, about 2 min06Consumer education/training
This domain tests how you teach the person with a developmental disability about their own health, rights, and self-management - and how you judge whether the teaching worked. The exam expects adapted methods and documented outcomes, not a pamphlet and a signature.
455 words, about 2 min07Service coordination/case management
This domain tests whether you can move a person safely through a fragmented system: multiple providers, funders, guardians, and settings. Exam items typically focus on transitions, closed-loop follow-up, and clear accountability.
411 words, about 2 min08Quality assurance
Quality assurance items test whether you can measure care, interpret the data, and change the system - and whether you can tell QA from QI. QA asks whether standards were met; QI asks how to make them met more reliably.
392 words, about 2 min09Documentation/record-keeping
Documentation questions test precision and defensibility: whether the record would support your judgment if read a year later by a surveyor, a physician, or a court. The standard is objective, contemporaneous, complete, and attributable.
412 words, about 2 min10Medication administration and treatments
Medication questions test the safety checks, the monitoring responsibilities, and the judgment calls specific to this population - polypharmacy, psychotropics, swallowing difficulty, and rescue protocols. Right person, right drug, right dose, right route, right time, right documentation - and, in practice, the right reason and the right to refuse.
432 words, about 2 min11Advocacy/consumer rights
Advocacy items test whether you recognize a rights violation and act on it, and whether you can support rights while managing genuine risk. The exam consistently prefers the least restrictive option that respects the person's choice.
418 words, about 2 min12Interdisciplinary team meetings
Interdisciplinary team items test your role in a meeting that turns separate professional assessments into one coordinated plan. The exam rewards preparation, person-centered participation, and follow-through, and penalizes the nurse who either dominates the meeting or says nothing clinical.
470 words, about 2 min