Planning an Investigation
Questions, hypotheses, variables, methods, risk assessment, apparatus selection, ranges, repeats, tables and diagrams.
How to study for CCEA GCSE Biology
Learn each process as a structure-and-mechanism chain, use data with units, and prepare every prescribed practical from planning through conclusion and evaluation.
Core concepts
Concept 1
A valid plan changes one independent variable, measures a defined dependent variable and controls material factors that could affect the result.
Exam cue: Define exactly what is changed, measured and kept constant, including units and measurement timing.
Concept 2
A justified range, interval, repeat strategy and apparatus resolution should match the expected pattern and size of change.
Exam cue: Choose equipment by range and resolution, then explain how it improves the evidence.
Concept 3
Risk assessment identifies hazards, evaluates the chance and severity of harm, and specifies proportionate controls rather than claiming zero risk.
Exam cue: Build the results table before data collection so headings, units and repeated values are unambiguous.
Risk pitfalls and guardrails
Calling the apparatus a controlled variable instead of naming the condition it keeps constant.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a biological mechanism with a vague purpose statement.
Writing 'be careful' as the only risk control.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a biological mechanism with a vague purpose statement.
Repeating identical measurements without calculating or using a representative result.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a biological mechanism with a vague purpose statement.
Memory anchors
Independent variable
The factor deliberately changed by the investigator.
Dependent variable
The measured outcome that may respond to the independent variable.
Controlled variable
A factor kept constant so it does not confound the comparison.
Hypothesis
A testable prediction with a scientific reason.
Resolution
The smallest change an instrument can distinguish.
Risk assessment
Hazard, possible harm, likelihood and severity, followed by suitable control measures.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
What is the independent variable?
What is the dependent variable?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
What is Pass Harbor?
Completely free exam prep for 247 UK exams.
- Practice questions
- Flashcards
- Study guides
- Mock exams
- No registration
- No paywall
- Start instantly
“No more expensive exam prep. Quality study tools should be accessible to everyone.”