CLO vs PLO: Course and Program Learning Outcomes Explained
Every accreditation visit comes back to two questions. What should students learn in each course, and what should they be able to do when they graduate? Here is how the answers fit together.
Quick summary: A CLO (course learning outcome) says what a student can do at the end of one course. A PLO (program learning outcome) says what a graduate can do at the end of the whole degree. CLOs are small and specific. PLOs are broad and are built up across many courses. Each CLO should support at least one PLO, and the link between them is shown in a mapping table. This guide explains both, compares them side by side, shows how to map and measure them for ABET and NCAAA, and lists the mistakes that cause problems during accreditation reviews.
When a department starts preparing for accreditation, the first few meetings usually go in circles. Someone says "outcomes" and means course outcomes. Someone else means program outcomes. A third person means the ABET student outcomes. Everyone is right, and nobody is talking about the same thing.
I have led an electrical engineering department through ABET accreditation and worked with NCAAA and other national frameworks across five countries. The confusion between CLOs and PLOs is the most common problem I see, and it is also the easiest to fix once the two levels are clear.
This CLO vs PLO guide gives you that clarity. It is written for faculty members, program coordinators, quality staff and students who want to understand how outcome-based education actually works.
01 What Is a CLO?
A course learning outcome (CLO) is a clear statement of what a student should be able to do by the end of one specific course. It must be observable and measurable, so that it can be checked with an exam question, an assignment, a lab or a project.
CLOs belong to the course. The instructor or course committee writes them, and they appear in the course syllabus and the course specification. Most courses have four to eight CLOs.
Here are three CLOs from a typical third-year control systems course:
- CLO 1: Derive the transfer function of an electrical or mechanical system from its differential equations.
- CLO 2: Analyse the stability of a closed-loop system using the Routh–Hurwitz criterion and root locus.
- CLO 3: Design a PID controller in MATLAB that meets given time-response specifications.
Notice that each one starts with an action you can see: derive, analyse, design. None of them says "understand" or "know". That is the single most important rule for writing CLOs, and we will come back to it in section 5.
02 What Is a PLO?
A program learning outcome (PLO) is a statement of what a graduate should be able to do by the end of the whole degree program. PLOs are broader than CLOs, and no single course can deliver one alone. They are built up step by step across the curriculum.
PLOs belong to the program. The department writes them, usually with input from industry advisors, alumni and employers, and they appear in the program specification. Most programs have between six and twelve PLOs.
PLOs in ABET
ABET uses the term student outcomes instead of PLOs. Engineering programs accredited by ABET's Engineering Accreditation Commission use seven student outcomes, numbered 1 to 7. In short, graduates must be able to:
- Identify, formulate and solve complex engineering problems.
- Apply engineering design to produce solutions that meet specified needs.
- Communicate effectively with a range of audiences.
- Recognise ethical and professional responsibilities and make informed judgments.
- Function effectively on a team.
- Develop and conduct experiments, analyse and interpret data, and use engineering judgment.
- Acquire and apply new knowledge as needed, using appropriate learning strategies.
If you want the bigger picture of how ABET reviews a program, read our guide ABET Accreditation Explained.
PLOs in NCAAA (Saudi Arabia)
NCAAA uses the term program learning outcomes. Since the 2020 update of the Saudi National Qualifications Framework (NQF-KSA), PLOs are grouped under three learning domains:
- Knowledge and understanding
- Skills
- Values, autonomy and responsibility
Programs that hold both ABET and NCAAA accreditation often keep one set of outcomes and show how the seven ABET student outcomes sit inside the three NQF domains. This saves a lot of duplicate work.
One level higher: above PLOs sit the program educational objectives (PEOs). These describe what graduates achieve a few years after graduation, such as working as practising engineers or continuing to graduate study. PEOs are about careers. PLOs are about abilities at graduation. CLOs are about one course.
03 CLO vs PLO: The Key Differences
The simplest way to remember it: a CLO is a brick, and a PLO is the wall. You build the wall from many bricks laid across several years. Here is the full comparison.
| Point | CLO (Course Learning Outcome) | PLO (Program Learning Outcome) |
|---|---|---|
| Level | One course | The whole degree program |
| Time frame | End of a semester | End of the degree (at graduation) |
| Written by | Course instructor or course committee | Department, with industry and alumni input |
| Typical number | 4 to 8 per course | 6 to 12 per program |
| Scope | Narrow and specific | Broad and general |
| Example | Design a PID controller in MATLAB that meets given specifications | Apply engineering design to produce solutions that meet specified needs |
| Evidence | Exam questions, assignments, labs, course projects | Combined results from several courses, capstone projects, surveys |
| Where it is written | Course syllabus and course specification | Program specification and self-study report |
| Other names | Course outcomes, COs | Student outcomes (ABET), graduate attributes |
04 How CLOs and PLOs Connect: The Mapping Matrix
CLOs and PLOs are not two separate lists. They form a chain. Every assessment in a course measures a CLO, every CLO supports one or more PLOs, and the PLOs together support the program's long-term objectives.
The link between CLOs and PLOs is recorded in a curriculum mapping matrix, also called a CLO–PLO map. Each row is a course, each column is a PLO, and each cell shows how strongly that course develops that outcome. Many programs, including those following NCAAA templates, use three levels:
- I (Introduced): the course presents the outcome at a basic level.
- P (Practiced): students apply it with growing independence.
- M (Mastered): students show it at the level expected of a graduate.
Here is a simplified example for an electrical engineering program, using the seven ABET student outcomes as PLOs:
| Course | SO1 | SO2 | SO3 | SO4 | SO5 | SO6 | SO7 |
|---|---|---|---|---|---|---|---|
| Electric Circuits I | I | I | |||||
| Signals and Systems | P | P | |||||
| Control Systems | P | P | P | I | |||
| Engineering Ethics | P | M | |||||
| Senior Design Project | M | M | M | P | M | M | |
| Advanced Lab | P | P | M | P |
A simplified CLO–PLO mapping matrix. Swipe sideways on a phone to see every column.
A good map tells you two things at a glance. First, every PLO has at least one M, so the program can show mastery somewhere. Second, no single course carries everything. If your map has a column with no M, or one course with an M in every column, the curriculum needs work before the accreditation visit.
Map at the CLO level, not the course level. Reviewers will ask which CLO in "Control Systems" supports SO2, and which exam question measures that CLO. If your map only links courses to PLOs, you will not be able to answer. Keep a second table inside each course file that links each CLO to its PLOs and its assessment items.
05 How to Write Good CLOs
A well-written CLO makes every later step easier: teaching, assessment, and reporting. Follow these steps.
Start with a measurable action verb
Use verbs from Bloom's taxonomy that describe something a student does: calculate, derive, analyse, design, build, test, compare, evaluate, explain. Match the verb to the level of the course. First-year courses lean on explain and calculate. Final-year courses lean on design and evaluate.
Name the specific content
Say exactly what the action applies to. "Analyse circuits" is too vague. "Analyse first-order RC and RL circuits in the time domain" tells everyone what will be assessed.
Add a condition or standard where it helps
A tool, a constraint or a performance level makes the CLO clearer. For example: "using MATLAB", "according to IEEE format", or "that meets given overshoot and settling-time limits".
Check it can be assessed
Ask: which exam question, lab or assignment will measure this? If you cannot name one, rewrite the CLO or remove it.
Link it to a PLO
Every CLO should support at least one PLO. A CLO that supports nothing at program level is either unnecessary or a sign that a PLO is missing.
✗ WEAK CLOs
- Understand the basics of control systems.
- Know Ohm's law and Kirchhoff's laws.
- Learn about PLC programming.
- Appreciate the importance of safety.
✓ STRONG CLOs
- Analyse the stability of a closed-loop system using root locus.
- Calculate node voltages in DC circuits using Kirchhoff's laws.
- Write a ladder logic program that controls a conveyor using timers and counters.
- Apply a lockout/tagout procedure to isolate a machine before maintenance.
06 How to Measure CLO and PLO Achievement
Writing outcomes is half the job. Accreditation bodies want evidence that students actually achieve them, and that the program acts on the results. There are two kinds of evidence.
- Direct assessment: student work that shows the ability, such as specific exam questions, lab reports, project rubrics and design reviews. This is the main evidence for both CLOs and PLOs.
- Indirect assessment: opinions about learning, such as course surveys, exit surveys, alumni surveys and employer feedback. This supports the direct evidence but cannot replace it.
Before you collect any data, set a target. A common target is: at least 70% of students score 70% or more on the items linked to the outcome. Your program may set a different level. What matters is that it is written down before the results come in.
Step 1: CLO achievement in one course. In Control Systems, CLO 3 (design a PID controller) is measured by Question 4 of the midterm and the final course project. 40 students were assessed. 31 of them scored 70% or more on those items.
Step 2: PLO achievement across courses. CLO 3 supports SO2 (engineering design). SO2 is also measured in two other courses. Their CLO results for SO2 were 64% and 72%.
Step 3: Close the loop. SO2 meets its target overall, but one course is at 64%. The program records an improvement action for that course, such as an extra design workshop, and checks the result next year. This "closing the loop" step is what reviewers look for most.
Some programs weight the courses instead of using a simple average, giving more weight to courses marked M in the mapping matrix. Either method is acceptable, as long as you explain it in your self-study report and apply it the same way every year.
07 Common Mistakes to Avoid
Using course grades as CLO evidence
A final grade mixes many CLOs together. A student can pass the course while failing one CLO completely. Measure each CLO with its own linked questions or rubric rows.
Copying PLOs into the course syllabus as CLOs
"Communicate effectively" is a PLO. In a course it should become something specific, such as "present a lab report following the department's technical writing guide".
Too many CLOs
Twelve CLOs in a three-credit course means twelve sets of data every semester. Four to eight focused CLOs give better evidence with less work.
A PLO with no mastery-level course
If no course in the map develops a PLO at the M level, you cannot show that graduates achieve it. The capstone project is usually the best place for M-level evidence.
Collecting data but never acting on it
Results that sit in a folder do not count. Reviewers want to see what changed because of the data, and whether the change worked.
Changing CLOs every semester
If outcomes change each term, you cannot compare results over time. Review CLOs on a fixed cycle, usually every program review.
08 Where KPIs Fit In
CLOs and PLOs measure student learning. Key performance indicators (KPIs) measure program and institutional performance, such as retention rate, graduation rate, student satisfaction and employment of graduates. NCAAA asks programs to report both.
The two are often handled by different committees, which causes gaps in the self-study report. A program can meet every KPI and still have weak evidence that students achieve its PLOs, or the other way round. Strong programs connect the two so that the learning data and the performance data tell the same story.
Dr. Ahsan Rahman's free Beyond Compliance series covers this connection in detail. Start with the Beyond Compliance introduction, then read CLO vs KPI (Volume 1) and CLO and KPI Integration (Volume 2).
Preparing for ABET or NCAAA Accreditation?
Dr. Ahsan Rahman supports engineering programs with CLO and PLO writing, curriculum mapping, assessment plans, self-study reports and mock visits, based on hands-on experience leading a department through ABET accreditation.
See Accreditation Services →09 Frequently Asked Questions
What is the difference between CLO and PLO?
A CLO (course learning outcome) describes what a student should be able to do at the end of one course. A PLO (program learning outcome) describes what a graduate should be able to do at the end of the whole degree program. CLOs are narrow and belong to a single course. PLOs are broad and are built up across many courses. Each CLO should support at least one PLO.
How many CLOs should a course have?
Most courses have between four and eight CLOs. Fewer than four usually means the outcomes are too broad to measure. More than eight usually means the instructor has listed topics instead of outcomes. Each CLO must be something you can assess with a specific exam question, assignment, lab or project.
Are PLOs the same as ABET student outcomes?
They play the same role. ABET uses the term student outcomes, and engineering programs accredited by ABET use seven of them, numbered 1 to 7. NCAAA in Saudi Arabia uses the term program learning outcomes, organised under the three learning domains of the national qualifications framework: knowledge and understanding, skills, and values, autonomy and responsibility. Many programs that hold both accreditations map one set to the other.
What is CLO to PLO mapping?
CLO to PLO mapping is a table that shows which course outcomes support which program outcomes, and at what level. Many programs mark each link as I (introduced), P (practiced) or M (mastered). The map proves that every PLO is taught and assessed somewhere in the curriculum, and it shows where the program collects evidence for each PLO.
How do you calculate CLO achievement?
First set a target, for example that at least 70% of students score 70% or more on the questions linked to the CLO. Then count the students who reached the score threshold on those questions and divide by the number of students assessed. If 31 of 40 students reached 70%, CLO achievement is 77.5%, which meets a 70% target.
What verbs should be used to write CLOs?
Use measurable action verbs from Bloom's taxonomy, such as calculate, design, analyse, compare, build, test, evaluate or explain. Avoid verbs you cannot observe, such as understand, know, learn or appreciate. A good CLO names the action, the content and, where useful, the condition, for example: design a PID controller that meets given time-response specifications using MATLAB.
★ Final Thoughts
The difference between CLOs and PLOs is simple once you see it. CLOs describe one course. PLOs describe the graduate. The mapping matrix connects them, and assessment data proves the connection works.
Most accreditation problems I have seen do not come from bad teaching. They come from outcomes that are vague, maps that stop at the course level, and data that is collected but never used. Fix those three things and the self-study report almost writes itself.
One thing to do this week: open the syllabus for one course you teach and check every CLO. Does it start with a measurable verb? Can you name the exam question or assignment that measures it? Does it link to a PLO? Rewrite any CLO that fails one of these checks.