. In other words, the set of criteria against which a design is to be evaluated will be closely bound to the type of values being pursued. At the same time, when evaluation occurs, it is almost certain that the delivery of one value will have implications for other values that may be in one way or another dependent upon it. Moreover, delivering one value may contradict another value in ways that had not been expected prior to the evaluation. In other cases, they may have unexpected benefits over and above the original intentions. For example, aspects of digital footprints that are designed to satisfy the desires of an individual may have knock-on benefits or drawbacks for governments. A further challenge in evaluation for HCI in 2020 will be the need to assess some of the longer term and more farreaching impacts of the design in question, and again this