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Since the publication of the Agile Manifesto in 2001, the agile approach has had a vast influence on software development. Most agile methods break down a mobile application into small increments, which allow users to test single components and validate the value of an App. As a user satisfaction is mostly based on the validated values. However, implementing software replanning sessions for each increment allows an App to grow substantially. Over time, complexity such as in fighting bugs and fixing defects pile up, causing an increase in development costs. Since many cost estimation methods are not tailored for agile mobile development, only a few are partially applicable. With the current highly dynamic environment of Apps, this research identifies and evaluates the effectiveness of these methods to date. Key findings show a lack of appropriate and scientifically sound methods in app cost estimation. Therefore, this paper suggests new techniques in agile estimation. The main goal is to model a budgeting tool based on app decomposition, in both theoretical and practical approaches. The work aims to improve the accuracy in predicting development costs in mobile applications.

Since internet services are more and more used in the daily private and business life, greater efforts on data security, credibility, confidence and trust regarding the networks, operators, service providers and security measures need to be performed. However, internet users often prefer a better performance and a greater availability of services rather than a higher data security for internet services. To verify if credibility, trust, confidence and data security are really less important in regard to the usage and usage frequency of internet services, the named variables and relations will be analyzed with an adjusted conceptual model based on elements of the Unified Theory of Acceptance and Use of Technology 2. This paper will describe the theoretical approach of the conceptual model and the research hypotheses for the later quantitative analysis.

Broadband markets are subjected to competition of different fixed (copper, coax, fiber) and mobile technologies (4G/LTE, 5G). In the case of internet-access, fixed broadband connections reach currently higher connections speeds than mobile connections. Due to new technologies as LTE Advanced and 5G, mobile accesses get a bandwidth boost and reach a stronger position in terms of broadband speed. This paper discusses mobile radio technologies' influence on broadband markets in the world and especially in Germany. We will answer the question: Will mobile infrastructures dominate broadband markets in terms of market share, access speed, distribution and number of subscribers? First we will give an overview of the current mobile and fixed broadband developments in the world and particularly in Germany, focusing on the number of subscribers, data traffic and revenues. In the second part of the paper, we discuss the field of competition and in which fields mobile and fixed infrastructures are in a direct competition. Furthermore, we will present the effect of the different technical characteristics of the mobile and fixed technologies and their impact on the broadband markets. Finally, we try to figure out how broadband technologies will develop in the short and long run.