Before We Start
What is the nursing process and why does it exist?
Before nursing had a formal process, care was inconsistent. Different nurses approached patients differently, things got missed, and there was no systematic way to ensure every patient received complete, safe care.
The nursing process — ADPIE — was developed to give every nurse a universal framework that works for any patient, any condition, any setting. It's not just a memorization exercise. It's the actual structure of how professional nursing works.
Think of it like a flight checklist. A pilot with 20 years of experience still uses a checklist before takeoff — not because they don't know what to do, but because a systematic process prevents human error. ADPIE is that checklist for nurses.
💡 The Memory Trick
"A Delicious PIE"
Assessment · Diagnosis · Planning · Implementation · Evaluation
Picture yourself eating a delicious slice of pie — you go through every bite in order, from the first forkful to the last. Skip a bite and you've missed part of the experience. Skip a step in ADPIE and you've missed part of the patient's care.
The Five Steps
ADPIE — what each step actually means
A — Assessment
Collect information about the patient — all of it
Assessment is the first and most important step. You cannot diagnose, plan, or treat a patient you don't understand. Assessment means gathering data from every available source:
Subjective data — what the patient tells you. "My chest hurts." "I haven't slept in three days." "The pain is a 7 out of 10." This is what ONLY the patient can tell you — their symptoms, feelings, and experiences.
Objective data — what you observe and measure. Vital signs, physical exam findings, lab results, medication list, medical history, appearance. This is information you gather yourself that doesn't depend on what the patient says.
Both types of data matter equally. A patient might say their pain is a 2 but look pale, diaphoretic, and be guarding their abdomen. The objective data tells a different story — and you need both.
💊 In practice: You walk into the room. You observe how the patient looks (objective), introduce yourself, ask how they're feeling (subjective), take their vitals (objective), review their chart (objective), and listen carefully to their concerns (subjective). All of this is Assessment.
D — Diagnosis
Identify the patient's nursing problems — not the medical diagnosis
This is where students get confused — a nursing diagnosis is NOT the same as a medical diagnosis.
A medical diagnosis is what the doctor determines: "This patient has pneumonia."
A nursing diagnosis is the nurse's identification of how that condition is affecting the patient's ability to function: "Impaired gas exchange related to fluid accumulation in the lungs as evidenced by SpO2 of 88% and labored breathing."
Nursing diagnoses come from the NANDA-I list (the official taxonomy of nursing diagnoses). They follow a specific format:
Problem (what's wrong) + Related to (the cause) + As evidenced by (the signs and symptoms you found in Assessment)
There can be multiple nursing diagnoses for one patient. You prioritize them using ABC and Maslow's hierarchy.
💊 In practice: Your patient with pneumonia has several nursing problems — impaired gas exchange, ineffective airway clearance, acute pain, activity intolerance, risk for dehydration. Your job is to identify all of them and rank them in priority order.
P — Planning
Set goals and decide what interventions will achieve them
Planning is where you decide what success looks like for this patient and how you're going to get there.
A good nursing plan has two parts:
Goals/outcomes — specific, measurable, achievable, relevant, and time-bound (SMART). Not "patient will breathe better" but "patient's SpO2 will be ≥ 94% within 2 hours of oxygen therapy."
Interventions — the specific nursing actions that will achieve those goals. These can be:
• Independent interventions — things a nurse can do without a physician order (repositioning, deep breathing exercises, education)
• Dependent interventions — require a physician order (medications, procedures)
• Collaborative interventions — done with other healthcare team members (physical therapy, dietary consultation)
The plan is documented and shared with the entire care team. It's a living document — it changes as the patient changes.
💊 In practice: For your pneumonia patient with impaired gas exchange — Goal: SpO2 ≥ 94% in 2 hours. Interventions: Apply supplemental oxygen per order, elevate HOB to 45°, encourage deep breathing and coughing every hour, monitor respiratory rate and effort every 30 minutes.
I — Implementation
Carry out the plan — and document everything
Implementation is where the care actually happens. You put the plan into action — administering medications, performing procedures, educating the patient, coordinating with the care team, and providing direct hands-on care.
This is the step most people think of when they picture nursing. But notice where it falls in the process — it's step 4, not step 1. You should never implement interventions before completing Assessment, Diagnosis, and Planning. Acting without a plan is how errors happen.
During implementation, you are also continuously re-assessing. Is the patient responding to the intervention? Are there new problems emerging? Is the plan working? Your observations during implementation feed directly into Evaluation.
Documentation happens simultaneously — if it wasn't charted, it wasn't done. Every intervention is recorded with the time, what was done, and how the patient responded.
💊 In practice: You apply the nasal cannula at 2L/min per the order, elevate the HOB, show the patient how to do incentive spirometry, administer the ordered antibiotic, and document each action with the time and the patient's response.
E — Evaluation
Did the plan work? Reassess and adjust
Evaluation closes the loop. You go back to your goals from Planning and ask: did we achieve them?
Goal met — the patient's SpO2 is now 96%. Continue the current plan, update documentation.
Goal partially met — SpO2 improved to 91% but hasn't reached 94% yet. Reassess, consider modifying interventions (increase O2 flow, try a different delivery device), update the plan.
Goal not met — SpO2 hasn't improved. Something needs to change. Reassess from the beginning — did you identify the right nursing diagnosis? Is the intervention appropriate? Is there something new happening?
Evaluation leads you right back to Assessment. This is why ADPIE is described as a cycle, not a straight line. You continuously assess, reassess, and adjust the plan throughout the patient's entire hospital stay.
💊 In practice: One hour after applying oxygen, you check the patient's SpO2 (93%), respiratory rate (20 breaths/min, down from 26), and ask how they feel. Not quite at goal yet — you increase the O2 to 4L/min, reassess in 30 minutes, and update your documentation.
Why the Order Matters
What happens when you skip steps
Skipping Assessment → jumping straight to Implementation
This is the most dangerous shortcut. A nurse who gives a medication without assessing the patient first may miss that the patient is allergic, that their blood pressure is already low, or that a new symptom has appeared. Assessment is never optional — even if you've cared for the same patient for three shifts.
Skipping Diagnosis → jumping from Assessment to Planning
Without identifying the actual nursing problem, the plan has no target. You might create interventions that address the wrong issue. A patient who is confused after surgery might have pain, hypoxia, or a medication reaction — each requiring a completely different plan. The diagnosis step forces you to think before you act.
Skipping Evaluation → treating Implementation as the final step
Implementation without evaluation is like giving someone a medication and never checking if it worked. Evaluation is what closes the loop and keeps the patient safe. It's also legally required — the patient's response to every intervention must be documented.
⚠️ The Three Traps Nursing Students Fall Into
Trap 1 — Confusing medical diagnosis with nursing diagnosis:
"Pneumonia" is a medical diagnosis. "Impaired gas exchange" is a nursing diagnosis. The doctor diagnoses the disease. The nurse diagnoses how the disease is affecting the patient's ability to function. Both exist simultaneously — they're not competing.
Trap 2 — Thinking ADPIE is linear and done once:
ADPIE is a continuous cycle. You assess, diagnose, plan, implement, evaluate — and then reassess. A patient's condition changes constantly. The process never truly ends until the patient is discharged.
Trap 3 — Skipping to Implementation:
This is the most tested NCLEX trap. On NCLEX, when a question asks what the nurse should do FIRST — the answer is almost always to assess further before doing anything. New nurses feel pressure to act. The nursing process teaches you to think before you act.