bankomeister: These are both the same thing. The difference in names come from the fact that the icon for these types of projects used to be a bucket. (Now it's more like a shoebox.)
If you select a project and open the inspector, look near the top to see "Type" followed by 3 icons. The blue box on the right represents a "Single Actions" project.
In a sequential project, there is one next action and all other actions are considered unavailable until this action is completed.
In a parallel project, there is one next action, but all the other actions are still available.
In a single actions project, all actions are available and none of them is the next action.
"Mail Holiday Cards" might be a sequential project:
1) Count people to mail cards to
2) Buy cards
3) Prepare cards for mailing
4) Take cards to post office
These actions won't work out of order.
"Clean House" might be a parallel project:
1) Tidy kitchen
2) Tidy bedroom
3) Scrub bathroom
It doesn't matter which one you do first, but they're all still working towards a goal, and having one of them marked 'next' might help you get cleaning.
A single actions project is sort of a concession to the fact that life doesn't always fit in neat little folders and index cards.
"Household repairs" might be a single actions project
1) Oil squeaky hinge
2) Replace hall light
3) Hammer down loose nail on back porch
They are all vaguely related, and there's no other good place to put them. But doing or not doing any one of them really has no effect on the others.
If you select a project and open the inspector, look near the top to see "Type" followed by 3 icons. The blue box on the right represents a "Single Actions" project.
In a sequential project, there is one next action and all other actions are considered unavailable until this action is completed.
In a parallel project, there is one next action, but all the other actions are still available.
In a single actions project, all actions are available and none of them is the next action.
"Mail Holiday Cards" might be a sequential project:
1) Count people to mail cards to
2) Buy cards
3) Prepare cards for mailing
4) Take cards to post office
These actions won't work out of order.
"Clean House" might be a parallel project:
1) Tidy kitchen
2) Tidy bedroom
3) Scrub bathroom
It doesn't matter which one you do first, but they're all still working towards a goal, and having one of them marked 'next' might help you get cleaning.
A single actions project is sort of a concession to the fact that life doesn't always fit in neat little folders and index cards.
"Household repairs" might be a single actions project
1) Oil squeaky hinge
2) Replace hall light
3) Hammer down loose nail on back porch
They are all vaguely related, and there's no other good place to put them. But doing or not doing any one of them really has no effect on the others.