What are task regions in the Spiral model.

Customer communication - In this region it is recommended to establish customer communication.

Planning - All planning doings are performed in order to define resources timeline and other project related activities.

Risk analysis - The tasks need to calculate technical and management risks.

Engineering - In this task region, tasks needs to build one or more representations of applications are performed.

Construct and release - All the essential tasks required to construct, test, install the applications are conducted.

Customer evaluation - Customer's feedback is gathered and based on the customer evaluation necessary tasks are performed and implemented at installation stage.