Abstract. In practice, collected data usually are incomplete and contains missing value.

The number of password-protected Internetbased applications is increasing significantly compared to a decade ago. Consequently, it causes an increase in the number of login credentials that users have to manage, for both Internet ad mobile environments. This paper presents a study that specifically focused on students' login credential management for mobile computing users. A behavioral study was conducted on 250 students from Universiti Utara Malaysia to understand how they managed their login credential while accessing the Internet via their mobile devices. The results suggested that students practiced poor login credential management. The paper recommends approaches that can be taken to improve login credential management for users with mobile devices. 

Data warehouse system is used to support the process of organizational decision making. Hence, the system must extract and integrate information from heterogeneous data sources in order to uncover relevant knowledge suitable for decision making process. However, the development of data warehouse is a difficult and complex process especially in its conceptual design (multidimensional modeling). Thus, there have been various approaches proposed to overcome the difficulty. This study surveys and compares the approaches of multidimensional modeling and highlights the issues, trend and solution proposed to date. The contribution is on the state of the art of the multidimensional modeling design.