How many people are needed to make a program or app?

Question

I realize that the software we use everyday was made by a team but, it is possible for one person to do a complex program, app, game, etc?

Answer 1

yes, but many hands make it faster, easier, and better. typically.

I mean, given the knowledge and time, you can do anything yourself

Answer 2

Yes there are few app which are developed by one and then redesigned by the team.