Although integrating UX practices into software development processes is a type of Software Process Improvement (SPI) activity, this has not yet been taken into account in UX publications. In this study, we approach UX integration in a software development company in Sweden from a SPI perspective. Following the guidelines in SPI literature, we performed a retrospective meeting at the company to reflect on their decade of SPI activities for enhancing UX integration. The aim of the meeting was to reflect on, learn from, and coordinate various activities spanned across various organizational units and projects. We therefore supported the meeting by a pre- generated timeline of the main activities in the organization that is different from common project retrospective meetings in SPI. This approach is a refinement of a similar approach that is used in Agile projects, and is shown to improve effectiveness of, and decrease memory bias. We hypothesized that this method can be useful in the context of UX integration, and in this broader scope. To evaluate the method we gathered practitioners' view through a questionnaire. The findings showed our hypothesis to be plausible. Here, we present that UX integration research and practice can benefit from the SPI body of knowledge; We also show that such cross-section evidence-based timeline retrospective meetings are useful for UX integration, and in a larger scale than one project, especially for identifying and reflecting on 'organizational issues'. This approach also provides a cross- section longitudinal overview of the SPI activities that cannot easily be gained in other common SPI learning approaches.