IBM BPM, V8.0.1, All platforms > Authoring services in Integration Designer > Developing business processes > Building human tasks
Extend human tasks using plug-ins
Business Process Choreographer provides an event handling infrastructure for events that occur during the processing of human tasks. Plug-in points are also provided so that you can adapt the functionality to your needs. You can use the service provider interfaces (SPIs) to create customized plug-ins for handling events and the processing of staff queries.
Information on this topic can be found by following this link: 
Create plug-ins to customize human task functionality.