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A task is the basic unit of a GanttSheet project plan with a start and finish time, as well as a duration.
You can add multiple tasks to a project, each with a different hierarchy level, and set dependencies between tasks to help you organize and manage your project more effectively.
The following image depicts an example of a simple project plan with only one task, which has only name, start, finish, and duration, and its mode is auto. On the tooltip, it indicates that the task is planned for November 10, 2022, from 8:00 a.m. to 5:00 p.m.
Let's discuss the properties of a GanttSheet task in the following sections.
In GanttSheet, a task is divided into three types:
Normal: A normal task is the most common task.
Summary: A summary task is a parent of other tasks.
Milestone: A project milestone is a task of zero duration that shows an important achievement in a project.
A task contains multiple fields from the data source.
Some of the common built-in fields in a GanttSheet project are task name, start and finish time, duration, etc.
Note: When manually scheduling a task, make sure that all task fields specified in the data source are present as columns in the GanttSheet view. Otherwise, the fields are not displayed in the GanttSheet project. For example, to view the applied task modes in your GanttSheet, the "mode" column must be included in the GanttSheet view area.
In a GanttSheet project, tasks can be scheduled in two different modes:
Auto Mode: Represents the task that is scheduled automatically. This means that start, finish, and duration fields are calculated based on task dependencies and other project settings. Note that the duration value is valid only if a task is in auto mode. If a task's duration is set, the task uses that duration. If not, the default duration used is one day for each task.
Manual Mode: Represents the task that is scheduled manually. You can set start, finish, and duration values manually for each task. The duration of each task is calculated from the root node, and the relationship between tasks is arranged based on the dependencies on predecessors and successors.
When using manual mode, consider the following conditions:
If only the end time is specified, the task becomes a finishOnly task.
If only the start time is specified, the task becomes a startOnly task.
If only the duration is specified, the task becomes a durationOnly task.
If there is no predecessor for a task in the Gantt chart, it starts at the same time as the parent node. However, if there is a predecessor, it starts when the predecessor finishes.
If the start, finish, or duration is not specified, the auto mode calculates the missing values based on the other fields.
If the start, finish, and duration are specified, but the duration does not match the difference between start and finish, it uses the start and duration values.
If the finish date is earlier than the start date, it sets the duration to one day by default.
If the finish date is earlier than the start date after scheduling, the task becomes a milestone with a duration of 0.
Note that when you adjust the start, finish, and duration manually, the task's color will change to reflect the adjustments, as shown in the image below.
The task schedules are recalculated in the following situations:
When initializing a project.
When setting the start time or calendar of a project.
When performing task-related operations, such as add, delete, indent, outdent, sort.
When creating dependencies between tasks (predecessors or successors).
Note: All schedule recalculations start from the root node. Each node has a parent/child hierarchy and dependencies on predecessors/successors.
Predecessors: The Predecessors field lists the task ID numbers for the predecessor tasks that must be completed before the current task starts or finishes. Each predecessor task is linked to another task by a specific type of task dependency and a lead or lag time.
Successors: The Successors field is the same as the predecessor field. The only difference is that the Successors field lists task ID numbers for the successor tasks that depend on the completion of the current task before they start or end.
The following image depicts the Predecessors field present in a GanttSheet project.