Task Leveling is a process of distributing the workload across the team, according to task duration and workloads that employees have up to a moment. This process refers to tasks which are granular enough to be distributed by portions among free or unloaded employees, so the task duration can be decreased drastically, while no employee stays idle. Task Leveling can be considered as a synonym of putting work in parallel by dividing this work in parts and assigning them to different resources working concurrently (in schedule compression it is called Task Crashing).
A term task leveling refers to a task’s depiction on a timeline where task portions can be recorded in single line (when assigned to one resource), or distributed among a few lines (levels) when assigned to multiple resources. By this effort, duration of this work decreases while task leveling increases. Task leveling is also a method to minimize amount of work put upon every particular employee. You can level your task by dividing the whole budget of time allocated for a task by employees (a total free time available for this task among the staff) by duration of this task (its formal estimated duration) – this yields how much effort per unit of time a task requires.