Leveraging the legacy of a series of successful workshops ([1],[2],[3]) that brought together people from Human-Computer Interaction (HCI) and Software Engineering (SE) communities to discuss the interplay between software evaluation and development, the proposed I-UxSED 2012 is further inspired by more recent insights into the issues pertaining to traditional usability (e.g. [4]) as well as the emerging User Experience (UX) (e.g. [5], [6]).

  The shift of emphasis in the field of HCI from usability engineering to a much richer scope of user experience where users' emotions, affects, motivations, and values are given as much, if not more, attention than ease of use, ease of learning and basic subjective satisfaction [7]. Among others, four challenges engendered by the new focus of UX are particularly relevant to software development: (i) definition of UX; (ii) modelling of UX; (iii) selection of UX evaluation methods; (iv) interplay between UX evaluation feedback and software development.

  The concept of UX is commonly understood as subjective, context-dependent and dynamic [7]. A "formal" definition of UX issued by ISO 9241-210: 2010 - A person's perceptions and responses that result from the use and/or anticipated use of a product, system or service - is ambiguous and needs to be refined.

  In contrast to usability, UX metrics are yet to be defined. The task is related to ongoing debates on the measurability of experiential qualities [8]. Both usability and UX measures should enable professionals to benchmark competitive design artefacts and to select right design options. The intriguing question is whether the respective measures have different persuasive power and impact on (re)design and development.

  Modelling users' experiences is especially important for understanding, predicting and reasoning about processes of UX with consequences for software design. However, a number of issues pertaining to UX modelling remain to be resolved [9].

  Recently, research efforts have been undertaken to collect, consolidate and categorize UX evaluation methods (e.g. [10]). It is envisaged that taxonomies of UX qualities, which can facilitate the selection of UX methods and measures, will come to fruition from these ongoing endeavours.

  The first three issues have significant impacts on their fourth one - the theme of I-UxSED 2012 - is only explored to a limited extent.