what is an isa? an isa is a controlled assessment. it tests your science skills. you need to...
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What is an ISA?
• An ISA is a controlled assessment. • It tests your science skills. • You need to complete one for each GCSE
in science that you do.
The ISA counts 25% towards that GCSE.
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Levels of Control
• Limited Control:
Candidates can work unsupervised and outside of the classroom. Candidates will carry out practical work under supervision.
• High Control:
Candidates work individually to complete their reports under conditions of high control at the centre and under direct, formal supervision.
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What is in an isa?
• Each ISA takes approximately 7 lessons to complete.
• It includes practical and written assessments in the form of two exam papers.
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Key Terms
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PrecisionPrecise Measurements are ones in which there is very little spread about the mean value.
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PredictionA prediction is a statement suggesting what will happen in the future, based on observation, experience or a hypothesis.
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RangeThe minimum and maximum values of the IV and/or DV.
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RepeatableA measurement is repeatable if the experimenter can use the same method and equipment and obtain the same result
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ReproducibleA measurement is reproducible if the investigation is repeated by a different person and the same results are obtained.
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ResolutionThe smallest change in the quantity being measured of a measuring instrument.
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Sketch GraphA line graph, not necessarily on a grid, showing the relationship between two variables. No plots or scales used, but line of best fit drawn and axes labelled.
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UncertaintyResults not quite where they are expected to be, which can be attributed to a problem with the method.
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Control Variable (CV)
A variable which is kept constant so that it does not affect the outcome of the investigation.
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Independent Variable (IV)
The variable that has values changed or selected by the experimenter.
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Dependent Variable (DV)
The variable that is measured for each and every change of the IV.
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AccuracyAn accurate measurement is considered to be close to the true value
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Variables
These are physical, chemical or biological quantities or characteristics
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Categoric Variable
Categoric variables are labels. For instance, type of material, brand of shoe or name of plant.
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Continuous VariableA variable that can have a quantity (a number).
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Calibration
Setting the scales to zero.
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Measurement Error
The difference between a measured value and the true value
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Systematic ErrorMeasurements that differ from the true value by a consistent amount.Caused by the method used, equipment or the environment.
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Random ErrorCause readings to unpredictably spread about the true value.Reduced by repeat measurements and the calculation of the mean.
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Zero Error
Any indication that a measuring instrument gives a false reading when the true value of a quantity is zero.
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AnomaliesThese are values in a set of results that are not judged to be part of the overall pattern.
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IntervalThe quantity between readings.
(e.g. Six readings equally spaced between 0 and 50cm would give an interval of 10cm)