Flexible

None

This constraint type indicates that a WBS item can start as soon as possible. This is a default constraint type applied to all new WBS items when they are scheduled from the project start date.

Semi-flexible

No earlier than

When this constraint type is set, the WBS item can start or finish on or after the specified constraint date. This is a default constraint type if a constraint start or end date-time is entered.

No later than

This constraint type indicates that a WBS item can start or finish on or before the specified constraint date.

Inflexible

On (No later than, No earlier than)

This constraint type indicates that a WBS item must start or finish on the specified constraint date.