Why is it important to use systems analysis and design methodologies when building a system? Why not just build the system in whatever way seems to be ""quick and easy""? What value is provided by using an ""engineering"" approach?

What is a costume plot? why is it important to a film or theater production?

Assume that there is a 4% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on three independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?

Whose task it is to ensure that the product flows logically from one step to another?