Over the last years, many mechanisms and techniques to monitor web applications have been proposed, such as, mining of log files from web servers and insertion of monitoring code directly in web applications. The adoption of these techniques presents several limitations such as: obstacles to correlate information from different web requests and/or requires several intrusive changes in the code of existing web applications. This dissertation presents an aspect-oriented framework to monitoring and analysing business processes. Aspect-oriented technologies are used to implement crosscutting variabilities of monitoring of web business processes. The framework has been developed using Java and AspectJ programming languages. It was instantiated and validated through the development of two different web applications.