Evaluating science learning — cognitive, psychomotor and affective

What this heading covers

Science is the subject where the three domains come apart most visibly. A child can define evaporation perfectly (cognitive), be unable to set up a thermometer without spilling it (psychomotor), and refuse to believe a result that contradicts what their uncle told them (affective). Each of those is a real outcome of science teaching, and only the first survives a written test.

That is why this heading exists, and why the paper sets it: assessing science only by writing assesses a third of it.

The three domains

Domain	What it covers	Assessed by
Cognitive	Knowing, understanding, applying, reasoning	Written items, oral questions, problems
Psychomotor	Physical skill — handling, measuring, drawing, manipulating	Observation of performance, checklists, rating scales
Affective	Interest, attitude, values, scientific temper	Observation over time, anecdotal records, participation, self-report

They are Bloom's three domains, and the names of the taxonomies are examinable.

Cognitive: Bloom's levels, with science items

Bloom's original levels, and the revised version in brackets, with a real item at each so the level is recognisable rather than abstract.

Level	Revised	A science item at this level
Knowledge	Remembering	"State the boiling point of water at sea level."
Comprehension	Understanding	"In your own words, explain why a wet cloth dries faster in sunlight."
Application	Applying	"A cup of hot tea cools faster when poured into a saucer. Use what you know about evaporation to explain why."
Analysis	Analysing	"Here are results from four seeds in different conditions. Which factor caused germination to fail, and how do you know?"
Synthesis	Creating	"Design an experiment to find whether salt water freezes at the same temperature as plain water."
Evaluation	Evaluating	"A classmate says heavier objects always fall faster. Is the claim correct? What evidence would settle it?"

Two things the paper tests:

• The revised taxonomy swaps the top two. In the original, Evaluation is highest; in the revised (Anderson and Krathwohl, 2001), Creating is highest and Evaluating is below it. A question asking for the highest level wants Creating if it names the revised taxonomy and Evaluation if it names Bloom's original.
• Most classroom and textbook questions sit at the lowest level. "Define", "name", "list" and "state" are all Remembering, and a paper built from them cannot distinguish understanding from memorising. That observation is itself an exam answer.

Recognising the level from the verb

Verb in the question	Level
define, name, list, state, label	Remembering
explain, describe in your own words, give an example	Understanding
use, calculate, predict, apply, solve	Applying
compare, classify, distinguish, why does, what caused	Analysing
justify, judge, criticise, which is better and why	Evaluating
design, plan, construct, propose	Creating

The caution worth having: the verb is a guide, not a rule. "Explain photosynthesis" is Remembering if the explanation was given in class and memorised. The level depends on what is new to the child, not on the word in the stem — which is a point a good answer makes.

Assessing process skills

The science-specific part, and the part generic answers miss. Process skills are cognitive outcomes and they need items that are not definitions:

• Observing — "Look at these two leaves. Write five differences." (Not: "what is observation?")
• Classifying — "Group these ten objects and say what rule you used." Open grouping is better than a given rule, because the rule is the outcome.
• Inferring — "The soil under the tree is dry after rain. Give two possible reasons."
• Predicting — "The first three seeds sprouted in 3, 4 and 3 days. When will the fourth?"
• Interpreting data — give a table or graph and ask what it shows, and what it does not.
• Experiment design — "What would you change, what would you measure, and what must stay the same?"
• Identifying a flawed test — present a spoiled experiment and ask why it proves nothing.

Psychomotor: Simpson's levels

Physical skill, assessed by watching the child do it. There is no paper substitute, and saying so is examinable.

Level	What it looks like in a lab
Perception	Noticing that the liquid level is read at eye height
Set	Being ready — apparatus arranged, sleeves up, knowing what comes first
Guided response	Doing it with the teacher's instruction step by step
Mechanism	Doing it unprompted with reasonable confidence
Complex overt response	Doing it smoothly and accurately
Adaptation	Adjusting the method when the apparatus or sample differs
Origination	Devising a new procedure for a new problem

Skills a science teacher actually assesses: lighting and adjusting a burner, measuring liquid in a cylinder at eye level and reading the meniscus, using a balance, reading a thermometer without lifting it out, focusing a microscope, filtering without tearing the paper, drawing a labelled diagram to proportion, planting and handling specimens, and following safety rules.

Tools: an observation checklist (did / did not), a rating scale (1–5 on each step), or a practical test where the teacher watches rather than marks a product. The record must be made during the performance; afterwards, only the outcome is visible and the outcome can be reached badly.

Affective: Krathwohl's levels

Interest, attitude and values — including scientific temper, which the syllabus treats as a principal aim of science teaching and which therefore has to be assessed.

Level	What it looks like
Receiving	Pays attention to a demonstration
Responding	Asks a question; volunteers to help set up
Valuing	Brings something from home to show; objects when evidence is ignored
Organisation	Weighs scientific explanation against other claims and can say why
Characterisation	Habitually asks for evidence, inside and outside the lesson

How it is assessed honestly: observation over time, anecdotal records, participation in investigations, questions asked unprompted, voluntary reading, care of equipment, and willingness to revise a stated position when a result contradicts it — that last being the clearest single indicator of scientific temper.

What it is not assessed by: a test asking "why is science important?", which measures the ability to produce the expected sentiment. A question offering that as the way to assess attitudes is offering the wrong answer.

The honest limits, which a good answer states: affective outcomes are slow, not reliably measurable in a single lesson, and should not be graded — recorded and reported, not scored.

Putting the three together

A practical on evaporation can assess all three at once:

• Cognitive — why the wet cloth dried faster in the sun; predict what happens if it is spread out.
• Psychomotor — measuring equal volumes of water into two dishes, reading the thermometer.
• Affective — did the child keep observing when the first reading was dull; did they accept the result when it contradicted their prediction.

CCE fits here: continuous means throughout rather than once, and comprehensive means across all three domains rather than only the written one. That pairing is asked directly.

A question of the kind the paper sets

The ability to measure 50 mL of water accurately in a measuring cylinder belongs to which domain? (a) cognitive (b) psychomotor (c) affective (d) cognitive and affective

(b) psychomotor.

The reasoning that makes it unambiguous: the child must know what 50 mL means and that the reading is taken at eye level from the bottom of the meniscus — that part is cognitive — but the stem says measure accurately, and accuracy here is a matter of hand and eye. The knowledge can be tested on paper; the pouring cannot.

A useful test for these items: could this be assessed in a written examination? If not, it is psychomotor or affective. If it could be assessed by a test but only over weeks of watching, it is affective.

Mistakes that cost marks here

• Assessing science only by written tests, which reaches one domain of three.
• Naming Evaluation as the highest level when the question specifies the revised taxonomy — there, Creating is highest.
• Assessing psychomotor skill on paper. It requires observation of the performance.
• Assessing attitude by asking about attitude. Observation over time, not a question.
• Grading affective outcomes, which the syllabus does not support.
• Reading "comprehensive" in CCE as "the whole syllabus". It means across all three domains.
• Treating the verb in a question as deciding its Bloom level. It depends on what is new to the child.
• Testing process skills by definition — "what is observation?" tests recall, not observing.

In one line

Cognitive, psychomotor and affective are Bloom's three domains with Bloom's, Simpson's and Krathwohl's levels inside them; the revised cognitive taxonomy puts Creating at the top; process skills need items that make the child observe, infer and design rather than define; psychomotor skill can only be watched; and attitude is recorded over time and not scored.

In the classroom

The single most useful change is replacing one "define" question a week with one that cannot be answered from memory — a table to interpret, a flawed experiment to criticise, a test to design. It costs nothing and it changes what children revise for.

For psychomotor assessment, a one-page checklist of the five or six skills a term's practicals actually need, ticked while walking around, is more honest than a mark out of ten awarded afterwards — and it tells the teacher which skill to demonstrate again, which a mark never does.