Abstract: Adaptation rules are prepared and applied against a parent language string in order to adapt the parent language string to a parent language variant. Previous adaptation translations are first used and then un-adapted translation units are matched against the adaptation rules that are applied to adapt the translation units. To design or text a user interface, a set of translation candidates is obtained for a source language string and one of the translation candidates is selected based on its size. The area of the selected translation candidate is calculated and a pseudo-localized string is generated based on the calculated area for the selected translation candidate. The pseudo-localized string is then used in generating or testing user interface displays.