Interrelation of the four main categories of criteria. Data quality and cost are represented on the horizontal and vertical axes (axis values are arbitrary). Relevance is represented by the size of the circles and feasibility by the intensity of their colour. Project A and B will both deliver data of high quality and high relevance. Although Project B data will be of slightly lower quality and slightly higher cost, this project may be chosen because of higher feasibility. Project C has little to recommend it, whereas Project D (low data quality, medium relevance and feasibility and low cost) might be prioritised depending on what the data will primarily be used for.