Water fall and spiral model:

1. Advantages of spiral model:

2. Estimating budgets becomes more accurate throughout the stages

3. Better to cope with changes of requirements

4. Disadvantages of spiral model:

5. More free flowing so its harder to follow for larger projects

6. Harder for each deliverable to be signed off

7. Better to adapt to unforeseen circumstances

8. The end user has only little to say in the development stage

9. If one thing is wrong then you have to back to the start to change it, which makes it time consuming.

10. Advantages of waterfall:

11. It is easier to follow

12. Each deliverable can be signed off

13. Allows the user to identify errors earlier

14. Disadvantages of waterfall: