The outset of this thesis is to raise questions on how we design for the mobile context and the capabilities of smartphones. Not only the presentation but also the use of input and interaction between a service and a user.This work evolves around sign up forms and answers the question: How does the sign up process affect the holistic perspective of a digital service regarding usability and user experience?This thesis consists of a case studies, and design experiments conducted on Twitter, Instagram and Randos sign up processes to explore if and how the usability, and the user experience could be affected and im- proved.This concluded some important aspects to be considered when designing sign up forms for a digital service.The usability, and the user experience is not only affected by user interaction, and the choice of input method but it’s also affected by which data the service is requesting, and more important; if that data is motivated to request by the service.

Nowadays more and more web applications are becoming part of everybody’s daily life. Lots of Internet users are bothered by having to create new accounts on websites. But at the same time, it is believed that sign-up as well as sign-in is a good registration solution which is difficult to replace.  In this thesis we considered a certain scenario in which a number of people need a short period of co-operation for certain tasks by using a web application. If everyone creates an account, it will be significantly annoying since it will increase everyone’s work and extend the working period. Due to such consideration we have supplied a possible solution that one user with an account works as a super-client, and then generates short-lived login codes or links for others who work as sub-clients. This solution is called SDMS which is short for Super-client Driving Multiple Sub-clients.  The thesis work contains the description and analysis of SDMS as well as designing and developing an example application. The example application is an online board game assistance platform, whose user scenario exactly fulfils the case of multiple users co-operating for a certain task that has been mentioned in the previous paragraph. Finally, we draw the conclusion that SDMS could improve the user experience in certain scenarios. / Numera blir allt fler webbapplikationer en del av allas dagliga liv. Massor av Internetanvändare stors av att behöva skapa nya konton på webbplatser. Men samtidigt tror man att både registrering och inloggning ar en bra registreringslösning som ar svar att ersatta.  I denna avhandling övervägde vi ett visst scenario dar ett antal personer behöver en kort period av samarbete for vissa uppgifter genom att använda en webbapplikation. Om alla skapar ett konto blir det väldigt irriterande eftersom det kommer att oka allas arbete och förlänga arbetsperioden. Pa grund av sådan övervägande har vi tillhandahållit en möjlig lösning att en användare med ett konto fungerar som en superklient och sedan genererar kortlivade inloggningskoder eller lankar for andra som arbetar som underklienter. Denna lösning kallas SDMS, vilket ar en förkortning for Super-client Driving Multiple Sub-clients.  Examensarbetet innehåller beskrivning och analys av SDMS samt utformning och utveckling av en exempelapplikation. Exempelapplikationen ar en online brädspelassistansplattform, vars användarscenario exakt uppfyller fallet med att flera användare samarbetar for en viss uppgift som har nämnts i föregående stycke. Slutligen drar vi slutsatsen att SDMS kan förbättra användarupplevelsen i vissa scenarier.