Title: SUMMARY

The four sector model for general communicational contexts introduced offers a systematic approach to understand the need for privacy and security of communication within and across the borders of sectors. Typically security and privacy show certain characteristics in the private, business and government related sector. The need for security and privacy in the public sector shows a certain range, depending on specific communicational contexts. In addition the type of communication (1:1, 1:n and the composition of the group n) has an impact on the levels of privacy and security needed.  

The sectors show certain characteristics, each concerning the type of mobile applications that are used (for example specific governmental applications in the governmental sector) and driving forces for the markets within these sectors (for example fashion in the public sector). These characteristics cannot easily be transferred to other sectors. They define directions and borders of future developments of applications within or across the sectors.