The present invention relates to data processing systems and methods to facilitate debugging, development and execution of multidimensional database queries, such as MDX (Multi-Dimensional eXpressions), for a multidimensional database structure on a computer architecture running on a server, such as an OnLine Analytical Processing Server (OLAP). The expression or query can be broken down and executed incrementally and associated with contextual information which can be viewed by an end-user via an understandable user interface. The advantage is the drastic simplification of very complex computations, giving the user a perspective not available till now. This allows users to better understand multidimensional queries, find errors that occur in the execution and correct such errors.