The document discusses different types of measurement scales used in research. There are four main types of scales - nominal, ordinal, interval and ratio scales. Each scale has different properties in terms of description, order, distance and origin. Nominal scales only have the property of description, ordinal scales add the property of order, interval scales add the property of distance and ratio scales have all four properties including a true origin point. The appropriate statistical techniques that can be used depend on the level of measurement of the scale. Comparative and non-comparative scaling techniques are also discussed including paired comparison, rank order, constant sum and Q-sort scales.