When Joe starts LocaShare,he sees
the home screen shown in the figure.
At a glance, he can see (i) how many
social contacts are near him,
(ii) whether (and how many) people
have added him as a contact and
(iii) the number of offers by stores near
his current location. There are also two
tabs that he can use to access his
social and commercial contacts.
* Upon clicking the link “view” near
(i), he sees the names of social contacts
that are near his current location. By
clicking on the button “View Contact”,
he can view further details. He can also
choose to return back to the home screen.
* Upon clicking the link “view” near (ii), he
sees the names of people who added
him as a contact. The relationship between
Joe and that person (e.g., Susan) is not
established till Joe also adds Susan as his
social contact. By pressing the button “Set
Permissions”, Joe can add Susan to his
list. If he does not want to share his location
information with Susan, he can choose to
“Deny Request” and Susan would not be
able to track his location (since he will not
appear as her social contact). By selecting
either “Set Permissions” or “Deny Request”,
he can remove the person’s name from this
screen (otherwise, LocaShare will keep
reminding him till he takes one of the two
actions). As in the previous case, he can also
choose to return back to the home screen.
* Upon clicking the link “view” near (iii), he sees
a list containing thenames of stores that are
offering discounts or sales in exchange for his
location information. The list is sorted by the
number of offers per store (decreasing order)
and the distance of the store from Joe’s current
location (increasing order). Also, the list can
be color-coordinated (based on the amount
and type of location information required) to
help Joe decide quickly whether or not to view
the offer(s) from the store. As in the previous
cases, he can also choose to return back to
the home screen.

Easy to learn where to click and how to navigate.

Easy to navigate.

Nothing dangerous can happen.

The most essential capabilities are directly visible.

However, only numbers are directly visible, if you
know that someone has added you (if they notify you),
you still have to click the "view" link and then acknowledge the relationship.

Joe starts from the home screen and clicks on the
tab “Social Contacts”. He is then taken to the screen
shown here that can be considered the “Home
Screen” to handle his social contacts. Here, he can
(i) search for an existing social contact or (ii) add a
new one. Since Bob is not on his contact list, he
selects “Add New Contact”. He is then taken to the
screen that shows the various settings he can use
to control the amount and type of his location
information that Bob can view. He first enters the
contact’s name (Bob) in the text field. Since he is
primarily interested in sharing his location information
with Bob during the ski trip, he selects “Sunday River”
on the map by clicking on the appropriate location
(by zooming in/scrolling across the map/using
other features that the map API provides). After
receiving the selection from the click, Joe sees a
feedback in the form of a keyhole marker. He can
choose to add additional permissible locations, but
in this scenario, he does not want to. He then enters
2 in the textfield for radius and selects the option of
GPS coordinates for the value. Now, Bob will be able
to see his GPS coordinates in a 2 mile radius around
Sunday River. Joe can also select the frequency of
share and selects it to be daily (since he wouldn’t be
moving too far from Sunday River on an hourly basis).
He selects a time range during which Bob can view
his location. Here he selects 9am-9:30am. Suppose
that he also chose to share between 11:30am and
4pm. In that case, Bob will not be able to view Joe’s
location at 6pm (for example). He choose not to let
Bob see his aggregated information and thus leaves
the checkbox titled “Allow Aggregation?” blank. He
then clicks the button called “Save Contact”. He can
also cancel the form and start it again, if he wants to.
Now, Bob will receive a notification on his “Home
Screen” that Joe added him as a contact. If he would
also like to share his location, Bob can add him as
a contact and the relationship would be established
on LocaShare.

Some of the location-sharing options are not
easy to learn. If you are just given a map, how would the user learn what to do with it?

Since all the features are
clearly labeled, user can set the sharing options very quickly.

Possible to make mistakes
and over-/under-share information.

Controls are clearly visible.

Joe starts from the home screen and clicks
 on the tab “Commercial Contacts”. He is
then taken to the screen shown here that can
be considered the “Home Screen” to handle
his commercial contacts. Here, he can view
various categories of products on a wheel.
 This visual representation helps him view
various categories in a quick glance. Tiny
numbers enclosed in circles indicate the
number of offers by merchants/stores
belonging to that category. Since Joe is at
a ski resort and wants to buy some gear,
he selects the wedge titled “Sporting Goods”.
He is then taken to the next screen that shows
him the list of stores selling sporting goods
and having offers. Here, Rei happens to be
the store offering the two discounts in this
category. Since the two offers require different
location information (either in type or amount),
the actual location value is not displayed here.
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="9ff935895b161437-97e43532-410c4e82-a93b9d53-cd82fa129ef9272afdb412da"><ac:plain-text-body><![CDATA[[Note: you can view the sketch in the “Home
]]></ac:plain-text-body></ac:structured-macro>
 screen” section to see an example of the
location information displayed below the store
names]. The distance from his current location
to Rei is also displayed (0.2 mi). Once he clicks
 on the region, he is taken to the next screen
where he can see the two offers. Here we see
that Rei is offering a 10% off in exchange for raw
GPS coordinates. By default this would mean
GPS coordinates in that state. We display Joe’s
current GPS lat/long coordinates to help him
visualize the exact information he will be sharing.
The second offer involves a 25% discount in
exchange for a weekly aggregate information
. This means that LocaShare will aggregate
Joe’s information into meaningful chunks and
share them with Rei. In both cases, Joe can
choose to accept or delete the offer by pressing
the “Accept” or “Delete” buttons respectively.
If he returns to the previous screen, these offers
 do not disappear from the screen and will be
 shown to him the next time he views the “Home
Screen” for commercial contacts. Suppose that
Joe decides to take Rei up on the first offer. He
would now see the following screen that summarizes
the information that Rei will receive and gives Joe to
add Rei to a category (in case he wants it to be
displayed in another category, or create a new category
 for this merchant/store). He can then save Rei as a
contact by pressing the “Save Contact” button or cancel
the offer by clicking “Cancel”. If he clicks on “Cancel”,
he will be taken back to the “Home Screen” for
commercial contacts.

The numbers do not make sense as they are not labeled or defined on the screen.

Have to go through four screens to establish the commercial contact relationship.

If you over-share information, the only way to cancel that is by deleting the contact relationship. Not very efficient in that respect.

Options and controls are clearly visible.

Since Joe wants to modify the location permissions
for Bob, he first searches for Bob on the “Home
Screen” for social contacts. After he comes to
Bob’s profile, he clicks on Bob’s icon/photo and
comes to this screen. Here he view the amount
and type of information that Bob can view about
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="b4636d45576373e0-d93452fb-44454ccf-a1e7bd04-a85c044c73987fa4b4ee6da3"><ac:plain-text-body><![CDATA[him. [Note: Suppose that during the trip Joe
]]></ac:plain-text-body></ac:structured-macro>
allowed Bob to view his aggregated information.]
Joe can see that Bob can see his current location
as the lat/long in Cambridge, MA (his current
location). He also sees the pie chart/wheel that
describes the categorization of places that Bob
was able to view about him. He can now choose
to modify the permissions by clicking on the button
called “Modify Permissions” or can choose to
return by clicking “Cancel”. Once he clicks “Modify
Permissions”, he taken to the permissions sketch
described in task 1.

The task is not very easy to learn in these two slides, since the bulk of the editing happens in the permissions screen.

May be helpful to have a "Cancel This Option" button beside the specific/aggregate information display. That way, the user does not have to go to the permissions screen to cancel aggregation option (for example).

No irreversible action possible in these two screens.

The data that the social contact (user's friend, for example) can see is very visible and easy to understand.