This diploma thesis describes the design of an information system for Klub JUNIOR -- centre of children's free time activities operating in the suburb of Pra-gue 4. The main objective is to design and analyse options of the acquisition and implementation of information system in this organisation that does not use any IS yet. Thanks to the launch of the IS the organisation should be able to digitise, centralise, manage and archive all information and documents and generally to get more effective in its operation. These things can be described as secondary objectives of this thesis and its potential contributions. Also the selected method of acquisition of the IS gives instructions on how to solve this problem in similar non-profit organisations, which is another contribution of this thesis.

This thesis focuses on analysis, definition and description of mobile personal assistants as a phenomenon emerging in past few years. Mobile personal assistants are first mentioned in the context of computational linguistics and information needs, which is one of the motivations to use them. Main interest of this thesis is an introduction of the core technologies for the natural language communication between the assistant and its user, followed by an introduction of host environments and possible usage. The thesis also presents the limitations and risks resulting from using them, which are in some ways affecting their usability. Beside the analysis the main focus is on the design and implementation of the natural language understanding (NLU) system, which can be used in particular personal assistant application. This system is implemented as a web service and consists of an annotation scheme with a set of components. The results show that the system architecture and tools used are suitable solution for the construction of a basic NLU system, which has been created and which is in the compliance with the requested parameters. It is still difficult task to achieve high precision, which depends on many factors including the amount of training data, which was very small in this case. However, the resulting application is a solid starting point for its further development and extensions.