Lifecycle
The Systems Engineering Lifecycle
It is the highest level technical lifecycle for a product or system being built. When a system is developed, people from multiple disciplines have to work together to make it. It starts with a system concept and ends with system integration.
graph TD
Step_1:_Analyze_Requirements-->Step_2:_Design_The_Architecture_And_Allocate_Requirements_To_The_Parts
Step_2:_Design_The_Architecture_And_Allocate_Requirements_To_The_Parts-->Step_3:_Build_The_System
Step_3:_Build_The_System-->Step_4:_Integrate_&_Test
General Model of a Lifecycle
They follow a sequence of phases or time period.
graph LR
Phase_1-->Phase_2
Phase_2-->Phase_3
Phase_3-->Phase_4
Phase_4--> ....
The phases need not be equal in length. Each phase may have a sub-phase.
Not all Lifecycles are sequential. There can be Overlapping Phases, Parallel Phases, Repeated Cycles.
Typical Product Development Lifecycle
graph LR
Research-->Marketability
Marketability-->Prototype
Prototype-->Final_Development
Final_Development-->Production
Phases: Distinct periods of time during which development occurs.
Milestones: Events that mark phase boundaries
Goals: Objectives for each phase and overall development.