parallel with any other concurrent job of the stroke as well as with any update job executed by the scheduler Example: in Scale Image action each job scales its own layer. All the jobs are executed in parallel SEQUENTIAL if the job is sequential, no other job may interleave with this one. It means that when the scheduler encounters a sequential job, it waits until all the other stroke jobs are done, starts the sequential above a job may be defined as EXCLUSIVE. Exclusive property makes the job to be executed on the scheduler exclusively. It means that there will be no other jobs (strokes or updates) executed in parallel