• In case of some software deliverables, especially the large ones, it is difficult to assess the effort required at the beginning of the software development life cycle.

• There is lack of emphasis on necessary designing and documentation.

• The project can easily get taken off track if the customer representative is not clear what final outcome that they want.

• Only senior programmers are capable of taking the kind of decisions required during the development process. Hence it has no place for newbie programmers, unless combined with experienced resources.