## 3 Materials and Methods
### Selection of Display Technologies and Their Usage Properties  
Five display technologies were considered, image rendering (2D), 360 rotation display (360\({}^{\circ}\)), augmented reality (AR), non-immersive virtual reality (ni_VR) and immersive virtual reality (i_VR), to include a wide range of the main technologies currently used to display products.  
For the usage properties to be selected, the intention was for them to be representative of a variety of characteristics and not be focused only on functionality and usability, to collect different aspects of a global product experience. Therefore, in addition to the usefulness and ease of use, other functional and also more subjective benefits should be considered [21]. On the one hand, the three levels of the hierarchy of users' needs proposed by [PERSON] [25] were considered to collect characteristics from the literature [17; 21; 22; 45] related to the functionality, usability, and enjoyment (pleasure) of the technology. At the basic functionality level, _Realism_ and _Usefulness_ were considered. The possibility of observing the product from different perspectives (referred to as _Angle_) was added as a distinguishing feature between the traditional 2D display method and new technologies. The properties _Easiness_, _Comfort_, and _Trust_ in product display were selected at the usability level. Finally, at the pleasure level, properties related to emotional benefits were considered, such as _Satisfactory experience_ and _Fun_.  
Furthermore, three media characteristics of interactive technologies were adapted from the review by [PERSON] [23]: _Interactivity_, _Immersivity_, and _Availability_ (from the original Virtuality and Mobility, respectively). _Tangibility_ was also added as a factor in product evaluation [24]. The complete list of usage properties and their description in the study are shown in Table 1.  
As global indicators, two variables related to the affective and emotional aspect were added: _Decision_, to assess whether the display technology influences the final decision; _Expectations_, to rate if the display technology meets the user's expectations.  
\begin{table}
\begin{tabular}{p{42.7 pt} p{113.8 pt} p{113.8 pt}} \hline \hline \multirow{2}{*}{**Type**} & \multicolumn{2}{c}{**Usage Property**} & \multicolumn{1}{c}{**Description**} \\ \hline \multirow{3}{*}{Functionality} & Realism Angle & It provides a realistic representation: it has sufficient quality and resolution \\  & Usefulness & It allows the product to be viewed from any angle \\ \hline \multirow{3}{*}{Usability} & Trust & It provides trust and security; it offers sufficient information to evaluate the product and to decide without risks \\  & Easiness & It is easy to use \\  & Comfort & It provides comfort \\ \hline \multirow{2}{*}{Pleasure} & Satisfactory experience & It provides a satisfactory shopping experience \\  & Fun & It provides fun \\ \hline \multirow{3}{*}{Media} & Interactivity & It provides interactivity: interaction with the presentation is allowed \\  & Immersivity & It provides immersivity: you feel you are inside the represented environment \\ \cline{1-1}  & Availability & It provides accessibility at home and can be used when shopping \\ \cline{1-1}  & Tangibility & It allows product features to be perceptible to senses \\ \hline \hline \end{tabular}
\end{table}
Table 1: Usage properties considered to study their perception depending on the used display technology.