Phases of Waterfall Lifecycle Model

Phases of a Waterfall Software Life Cycle with Associated Activities
and Artifacts

Phase	Activity	Output
Concept	Define project goals	White paper
Requirements	Decide what the software must do	Software requirements specification
Design	Show how the software will meet the requirements	Software design description
Development	Build the system	Program code
Test	Demonstrate requirements satisfaction	Test reports
Maintenance	Maintain system	Change requests, reports

[Source]

Also See:

Disadvantages of Waterfall model
Waterfall model, When to use it, its advantages & disadvantages