Step 4: Normalisation

In step 4, the effect-scores are processed using a scaling factor so that the measures’ performance can be compared with each other.

1. Processing the effect-scores

Effects recorded in different units and different magnitudes cannot be compared to each other or aggregated into one final score without a further processing step. This step is called normalisation, and involves translating the original effect-scores into a score which does not have a unit. Also, normalisation removes the magnitude of the original scores.

The TIDE method’s normalisation uses a maximum score approach, whereby the normalised effect-score is relative to the largest score for any of the measures for that effect (using the formula on the next page).