• Graphical techniques are an effective means of communicating the effect of an independent variable on a dependent variable, and can lead to determination of physical quantities.

• Sketched graphs have labelled but unscaled axes, and are used to show qualitative trends, such as variables that are proportional or inversely proportional.

• Drawn graphs have labelled and scaled axes, and are used in quantitative measurements.

• Drawing graphs of experimental results including the correct choice of axes and scale.

• Interpretation of graphs in terms of the relationships of dependent and independent variables.

• Production and interpretation of best-fit lines or curves through data points, including an assessment of when it can and cannot be considered as a linear function.

• Calculation of quantities from graphs by measuring slope (gradient) and intercept, including appropriate units.