Suddenly the schedule is a work of fiction. The project's success is jeopardized. These are project risks.
Risks are an unavoidable part of all projects.
The key is to anticipate as many of them as possible at the start of the project, build in contingencies wherever possible, and manage any risks that do arise. The following are examples of risks that may threaten a project. The project manager, the team, and the client should all have a thorough and identical understanding of the project's goals and scope. The project's timeline is unrealistic. The rush to launch a web product can lead to unrealistic schedules that don't allow for completion of tasks.