The effect on the User Experience (UX) brought about by a newly-implemented product change is something that is both necessary yet difficult to measure. This is because changes in the user experience tend to be generic in nature and may not directly relate to the quality of the UX or the overall goals of the project. At the same time the ability to measure this effect will help you take decisions related to future product modifications. This article discusses how the HEART framework can be applied in conjunction with the Goals-Signal-Metrics process in order to establish which metrics can be used to measure the UX of a product. It will also discuss how we have applied this combination when choosing UX metrics for our product, Sales Manager – an application that supports sales on Allegro. (usabilitygeek)