Quantitative – Information involves numbers and deals with the numerical measurements of something.

Qualitative – information refers to the nature of something, may be more subjective for example “If your pet cat is black and has mass 4.1kg then the colour , black is a qualitative description while the mass 4.1kg, gives a quantitative measurement.

Data – Is a collection of information on a particular topic which may be quantitative or qualitative. – For Engineering purposes you are usually most interested in technical data, much of which is quantitative.