RESUMENPresentamos una nueva estructura de almacenamiento que denominamos DW Histórico y que contiene, explícitamente, el tiempo válido. Nuestra propuesta combina, en un modelo integrado, una Base de Datos Histórica y un DW. El objetivo del modelo propuesto es resolver las limitaciones temporales de las estructuras multidimensionales tradicionales. Aunque el DW Temporal considera, además de la dimensión temporal, otros aspectos vinculados con el tiempo, este modelo solo contempla los cambios que se producen en las dimensiones y jerarquías. Por consiguiente, en virtud de contemplar la necesidad de registrar valores que permitan evaluar tendencias, variaciones, máximos y mínimos, un problema a resolver es cómo registrar, en el diseño de la estructura multidimensional, la variación temporal de los valores de entidades, atributos e interrelaciones, ya que, si bien sabemos que los datos necesarios están almacenados, los mecanismos de búsqueda temporal serían complejos. El diseño del DW Histórico está enmarcado en el enfoque del Desarrollo de Software Dirigido por Modelos, una estrategia que permite, mediante sucesivas transformaciones automáticas, obtener una implementación del modelo multidimensional en un Sistema Administrador de Base de Datos Relacionales (SABDR).Palabras clave: Método de diseño, desarrollo de software dirigido por modelos, data warehouse, base de datos histórica, tiempo válido. ABSTRACT We present a new storage structure that contains the explicit valid time called Historical DW. This proposal combines a Historical Data Base and a DW in one integrated model. The objective of this model is to solve the temporal limitations of the traditional multidimensional structures. Although the Temporal DW considers, besides the temporal dimension, other aspects related to time, this model only takes into account the changes that occur in the DW

The new models of teaching and learning have their focus on technology, especially on issues related to ubiquity. The impact of ICT in education generates new learning opportunities: the mobile or ubiquitous, which open new doors to technological environments that allow students to learn at any time and place, providing, in addition, tools that give the possibility to perform collaborative work and learning. The integration of a ubiquitous virtual teaching and learning environment with collaborative work forms the Ubiquitous Computer Supported Collaborative Learning model. What has been mentioned before allowed us to understand the importance of making a specification of this model that provides the possibility of using a tool for professional use in the Software Engineering during the teaching and learning processes, including the specific activities of evaluation and monitoring of works. These tools, called Computer-Aided Software Engineering, must be an active part of the uCSCL model. This integration, forms the model proposed in our work, called uCASE-CL. A prototype of the implementation of the model was developed, which we have called UAI Case. This solution is a proposal to cover the need to have tools that can be used in the teaching of the SE, and which allow the student to acquire and strengthen the academic learning.