Source:- forbes.com The traditional model for software development is the waterfall approach, where development “flows” downward like a waterfall through six phases: analysis, design, implementation, validation testing, integration and maintenance. Purists of this model maintain that a new phase should not be undertaken until the preceding phase has been completed, reviewed and verified. This process is effective but has its flaws — it lacks iterative processes and wastes time due to the duration of each phase. This approach is best