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               Home screen                            Find for friends by typing in the
                                                                                 search bar          


   Permission setting page of Joe
                  for Bob

To add a new social contact,
Joe starts from his home
screen and clicks on "My
friends" button. He finds Bob
by typing his name in the
search bar (which is located
at the upper right corner.) Bob's
picture pops out and Joe clicks on
the "Add friend" button to add him.
 
Joe then sets the permissions
for Bob. For example, in this
scenario,
1. Adjust the time by manipulating
    the clock-like interface.
2. Choose the places that are
     available for Bob by clicking 
     on the map. 
  (a)  Click on a new place to 
        create a new one. At the 
        same time, Joe can edit
        the place's radius by
        manipulating a transparent
        circle around the location
        bubble. Joe can also edit
        the name of the location 
        such as STATA or Boston by
        typing in the location bubble. 
             
   (b) Clicking on an existing 
         place can either delete it
         or edit it.
    
3. Hide/show aggregated information
    by clicking on the chart and the 
    Hide/Show button. Click on the
    tab menu to choose different
    kinds of aggregated information
    (weekly or monthly).

Pros: 
1. Adding friends is done in a 
similar way as other social apps.
2. The time/map widget makes 
very easy to select.It is also 
consistent with clock apps
and google maps. 
3. The map provides direct
manipulation which allows
user to choose the locations.  
4. When user chooses a location 
on the map. It provides  
immediate feedback by creating
a bubble around the location.

Cons:
1. Do users really need so much
freedom on the permission
settings?

Pros: 
1. Minimize the amount of
drop-down menu for permission
setting by using pictures and
maps.
 
Cons: 
1. It might be cumbersome 
for users to set the  
permissions of each 
social contact one by one.  
Aggregation should be 
used. (ex. group permission 
settings.) Efficiency problem 
can also be mitigated by 
providing default 
permission settings or history
 permission settings.
2. It would be too much
work for Joe to type the
name of a location or the
address, auto-complete
could be used here. 
   

Sources of potential
error in this interface
are that the user
enters the wrong
address, name of
location, or perhaps
enters a invalid time.

The auto-complete 
function should help
prevent incorrect
address. In addition,
the engine behind the
interface should 
provide hints to users
about the name/radius
of the location users
click on.

The clock widget,
map, and charts
are salient 
to users.

    
                   Home screen                     Find existing friend by either typing 
                                                                                     or browsing

    View Bob's location information

To view real-time location 
of a social contact, Joe 
starts from his home screen 
and clicks on "My friends". He 
can find his friends by either 
typing his name in the search 
bar or browsing through the 
list of friends. 

He then clicks on Bob's picture 
to view his location information.
In Bob's page, the button
" > Bob's LocaShare" indicating
the location information Bob is 
sharing with Joe. Also, his
current location is presented in
the "Current" area (White Mt.
in this picture).

Browsing through past locations
can be achieved by swiping 
the current location map.

Pros:
1. This UI is consistent
with familiar social apps like
facebook. And the map 
widget is consistent with
the Google map.
2. Swiping to view past 
information provides good
feedback. 
3. Map widget provides
 good affordance of the
location.

Cons:
1. Swiping to view past 
information is not obvious 
to users; thus the interface
is not communicating itself
to users. An arrow or an
icon here could be helpful.
2. The swiping direction.
Does swiping left mean
viewing past histories? 
An arrow or some texts
would better explain this.
3. Do users understand the
difference between
"> Bob's LocaShare" and
"< My LocaShare"? We 
need to test this in paper-
prototyping.
4. The question mark might
be misleading. Users
might think the system
doesn't function as
 expected instead of the 
location is unavailable.

Pros:
1. Once user find his/her friend,
viewing is simply one button 
click away.

Cons:
1. Swiping may not be the best
design if user wants to view the 
location information a long time
ago. However, the problem can 
be solved by showing a new 
page in which lists all the past
location information.

The only error here is not
viewing the desired data by
clicking on another friend's
picture. User can undo this 
by going to the home 
screen or the back button
on the browser.

The map is big such that 
users can see friends' current
location easily.

      
Mail box notifies Joe that there are        Click on the mail box to view the 
             offers available                                  list of  available offers


  View Rei's offer by clicking on Rei 

The mail box animation pops up
when there are offers available
to Joe. Upon clicking on the mail
box, Joe sees the list of offers.

To view Rei's offer, he clicks
on Rei's picture and sees the
location information that Rei 
wants from him in exchange
for the 10% discount.

In this scenario, Joe realizes the
information he will be exposed 
to Rei by his own example.
LocaShare mines for Joe's
past locations and visualizes
the information he is about to
share. Joe can choose to 
"Accept" the offer or "Cancel" it.

Pros:
1. Mail box animation is 
a good metaphor for 
receiving a notification.
Joe can easily understand
that there are things 
available to him.
2. Joe can easily learn the
information he will provide 
to the Rei by his historical 
location information. Learn
by example my own example
is an effective way to teach
user what will happen if I
accept the offer.
3. The ">" button on each of the
offer item is consistent with
other smart phone apps which
indicates that there are more
detailed information.

Cons:
1. If the list of offers is long,
scrolling down the long list
might be cumbersome. 
Would be better to aggregate
the offers by grouping them
into various categories.

Errors can result by
 clicking "Accept" or
"Cancel" too quickly.
However, this can be
easily resolved by
providing an alert
menu to confirm to confirm with
user again. Besides, 
user can always
terminate this offer by
going to the "My deals"
page.

The mail box animation 
provides high visibility
and good information
scent.

   
      The list of commercial contacts                           Rei's coupon             
 
The amount of location information Joe 
has share with Rei in exchange for the coupon

To edit a commercial contact. 
Joe clicks on "My deals" on the 
home screen and clicks on Rei.
The screen shows Rei's
offer for Bob, that is, 10%
discount in the scenario.
Bob can view how the amount
of location information he has
provided to Rei by clicking
on the "My LocaShare" button. 
Joe decides to terminate this
relationship by clicking on the
"Terminate" button.

Pros:
1. The interface for deals is
 internally consistent with 
the interface for friends.
2.

One of the errors might occur
in this interface is not  viewing
the desired data by
clicking on another deal's 
picture. User can undo this  
by going to the home  
screen or the back button 
on the browser. 
Also, errors can result by 
 clicking on "Terminate" too 
quickly. A confirmation alert
could be used to prevent this
problem.