Transaction Management in Database Management System
Do doors need instructions
1.
2. To Push or To Pull
That is the question!
The Jolly Rodger has run a ground and Captain Scurvy legs
Magee needs a new ship. So when he finds a lovely sea
fairing vessel he puts his crew straight to work to transfer
all the gold from the Jolly Rodger to the Ghost Ship.
On boarding the Ghost ship with arms full of treasure the
crew are faced with a problem, with a belly full of rum
they can’t figure out whether to push or pull the doors to
open them or slide them to one side in the new ship.
This causes the pirates to bump into one another and all +
the treasure being dropped all over the deck.
3. To Push or To Pull
That is the question!
Captain Scurvy Legs Magee is worried that his treasure is
going to fall into the sea, lost to the deep blue.
So he decides to teach his crew to look for signs on how
the doors work.
4. To Push or To Pull?
Plain Door
There are no obvious signs
on how to open this door
at all, except as it has no
handle it must require a
push rather than a pull.
5. To Push or To Pull?
Hinge Door
If you can see the hinges
you will know which side
it opens and that it will
open towards you, this
therefore means you need
to pull it.
6. To Push or To Pull?
Handle Door
Handles like this are
usually for pulling or
sliding.
7. To Push or To Pull?
Panel Door
You have to push
this, there is no other
option.
8. To Push or To Pull?
Sliding Door
You don’t push or pull this
one! It’s just for sliding.
9. To Push or To Pull?
Labelled Door
Labelled doors have
instructions on how to use
them. However doors should
be simple to use therefore
do we really want to read
instructions to make them
work?
The same handles have been
used for push and pull on
these doors can you see a
problem with this?
10. To Push or To Pull?
Bar Door
It is clear that you need to
push the bar to open the
door.
11. To Push or To Pull?
Knob Door
The knobs on this door
show you where to grasp,
but not whether to pull or
push it.
It is unlikely it will slide
12. To Push or To Pull
That is the question!
Once Captain Scurvy Legs
Magee had gone through
all the options he wanted
to see if his crew had
understood what he had
told them so he showed
them this door.
What can you see is wrong
with this door?
13. To Push or To Pull
That is the question!
It has a handle which can
be pulled
But it also has a panel
which can be pushed
You would need to see if
you can see the hinges, if
you can then the door
opens towards you and
therefore you would pull
this door.
14. To Push or To Pull
That is the question!
Doors should be simple use and even though Captain
Scurvy Legs Magee had to explain the rules to his
crew, when the doors didn’t work like they expected
them to, it means there is something wrong with the
design of the doors, not them.