## 1 Introduction  
The number of information and communication technology (ICT) users worldwide is dramatically increasing. People around the world are using ICTs, particularly the internet, for various purposes. According to [PERSON] _et al._, the ICTs act as an amplifier of human abilities, since they can amplify the human ability to communicate and create [1]. Some of the purposes people are using ICTs and the internet for, are also health-related. In their study, [PERSON] _et al._, have discovered that the use of the internet as a source for health information is growing in all age groups and for both genders. In their population study, they have found that users are also using the internet as a communications channel, both for reaching health professionals and for communicating health issues with their peers [2]. The term e-Health was first introduced in the late 1990s as a new term that describes the combined use of ICT, especially the internet, in the health sector [3]. The field of e-Health represents the promise of ICT to support, improve or enable health and the healthcare system [4]. Faced with increasing costs of patient treatment, and unfavorable demographic changes because of an aging population, health-care systems are focusing on efficient cost reduction without impairing health-care quality. The Ministry of Health in Slovenia presented e-Health as a possible solution to the problem and presented Slovenia's e-Health strategy to develop an efficient, flexible and modern national health-care informatics system [5,6]. Being familiar with all the benefits of e-Health and the strategic plan for the Slovenian health sector's informatization, the University of Maribor, along with other partners, has initiated an e-Health project. The project group is developing various e-Health services that are based on modern ICT solutions and will be available on several screens, such as television, personal computer, smart-phone and tablet. Depending on the purpose of use, the specificity and utility, the e-Health services in the project can be roughly divided into two groups:  
* Fully integrated telecare services for easy and safe independent living at home for older adults;
* Fully integrated telemedicine services for the remote monitoring of patients with chronic diseases, for home-care or for general practice care;  
Telecare services are intended for older adults in order to provide them with longer, easier and safer living in their homes. The telecare services enable older adults to choose where and how they would like to spend their old age. This is one of the possible ways in which the needs for the institutional care for older adults and the pressure on nursing homes could be reduced. The telecare services developed in the e-Health project are presented in Figure 1.  
Telemedicine services are intended for the remote monitoring of various chronic diseases. These services increase the availability of specialist medical services in rural areas and provide the possibility to obtain a second opinion. Additionally, the telemedicine services shown in Figure 2 provide specialist support for general practitioners, health workers, health resorts and insurance companies. Despite all the benefits, institutions and organizations can spend enormous amounts of resources on e-Health projects that eventually fail. This usually happens when the e-Health services do not meet the needs and expectations of their users [7]. Numerous design guidelines exist to support the design for different types of users. However, relying only on guidelines is not enough. Insufficient user involvement in the design and product architecture of e-Health services and the lack of evidence demonstrating the impact of e-Health services bring difficulties when it comes to the users' acceptance and adoption of such services.