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Bob launches the smart grid application and views the daily consumption for today (March 12th)
Looking at the graph he notices that his energy consumption was extremely high between 12pm and 3pm.


 

Pros:
The application provides an intuitive way to view the daily consumption. The graph makes it easy to see the power consumption throughout the day. 

The application presents the user with the option to view the monthly and yearly consumption by clicking the tabs on the bottom of the screen. In addition, the user can view the consumption for a specific device by clicking the device drop down list and selecting the device. These features are easily accessible to the user and the user is not required to click through different screens to discover these features.

Most of the features the application provides are presented to the user, enabling the user to easily explore and discover the various features the application offers.

Cons:
There is no way to overlay the consumption pattens of multiple devices, which would enable the user to easily compare the consumption patterns of different devices.

New users may be overwhelmed and confused by all the features presented on this main screen.

New users are more likely to misinterpret the data presented by the graph, not knowing that the different tabs enable them to view different data. 

Pros:
The tabs enable the user to view consumption patterns and pricing information for different devices on different dates. The user can easily access these features without having to click too many buttons or menus.

The user can easily access most of the features of the application without having to go to different screens. The user has quick access to most of the features.

Cons:
Since there is no way to overlay the consumption patterns of multiple devices, the user would have to work hard to compare the usage or consumption patterns of different devices.

Pros:
There is no way to make data-related errors on the main screen.

Cons:
The different tabs allow the user to change the display different data. Since the tabs change the mode of the displayed data, the user can easily make mode and description errors, such as viewing the information of the wrong device or clicking the wrong tab (looks similar to the other tabs). The ability to view different types of information for different devices with a single click, makes them more likely to forget which mode they are on.

There is no way to undo view actions, such as tab change.

Bob clicks the device list, which lists the available devices sorted by their energy consumption on march 12th, where the top item is the highest consumer. He selects the first item on the list, A/C1, which is one of the air-conditioning systems in his house.

The list above is an expendable list that has two groups, Consumers and Generators. The Consumers group contains all the appliances that consume energy and the Generators group contains all the appliances that generate power. The All option enables the user to view the total energy consumption or usage of all the appliances together. Clicking the group headers toggles between showing and hiding the items in the group (i.e. clicking the Consumers header once hides all the items in the Consumers group. Clicking again displays the items in the group.).

The list is sorted by energy consumption during the time frame that the user chose to view. For example, changing the date causes the list to be ordered by the consumption during the day of the selected date. Changing the view to display consumption by month orders the devices by monthly consumption. The items in the Generators group are sorted by the amount of power they generated.

The user can search for a specific appliance by typing its name into the dropdown textbox.

Pros:
Viewing data for different devices is easy to discover.

A new user attempting to find the most energy consuming devices is likely to click the device list in order to go through the different devices to find the ones that consume a lot of energy. By clicking the list and reading the label at the top of the list, the user quickly discovers that the list is ordered by consumption.


Cons:
The user has to click the list and read the label at the top of the list to discover that the list is sorted by consumption. Figuring this out could take a while, since users often do not read labels.

Pros:
The user can easily find the source of high energy consumption, since the list is sorted by power consumption.

The grouping of the appliances enables the user to easily distinguish the consuming appliances from the energy generators.

Cons:
A large number of devices may require the user to scroll and scroll and scroll, in order to get to a specific device.

The appliances are not grouped by their type, making it more difficult for the user to find all the appliances of a specific type (e.g. all ovens).

Pros:
No serious (irreversible data errors) errors can be made.

Cons:
The interface is more likely to cause mode errors as described above (in the previous section).

There is no way to undo selection choices, which can be annoying in cases where the list contains a large number of appliances, requiring the user to scroll down a lot.

The graph changes, displaying the total consumption for A/C1 on March 12.
Looking at the graph, Bob learns that A/C consumes a lot of power in the afternoon.

Pros:
The interface provides an intuitive way to switch between different data views.

The graph makes it easy to see the continuous change in energy consumption or usage.

Cons:
New users may find the tabs a bit confusing.

Pros:
The user can easily view different graphs for different types of data. All it takes is a single click.

Cons:
The graph displays the data for one appliance at a time or for all the appliances combined. There is no way to view and compare the consumption or usage data for multiple appliances by overlaying their plots.

Pros:
No serious (irreversible data errors) errors can be made.

Cons:
As mentioned above, the interface is more likely to cause mode errors.

There is no way to undo selection choices.

To see whether the additional power use is costing him much money, Bob looks at the current price information being provided by the grid by clicking the Pricing Info tab. He finds that it is a peak usage time and that prices are high.

Pros:
The interface provides an easy and intuitive way to the pricing information, accessible from all the different data view modes. New users can easily access this feature without getting lost.

The graph view provides a clear way to view the pricing info, even for new users.

Cons:
The pricing info does not depend on the selected appliance. This can be a bit confusing, since the other data graphs display appliance specific data.

Pros:
The interface provides a quick way to access the current price information from all view modes (i.e. it always requires a single click without going to a different screen).

Cons:
There is no way to view the price information as a table.

There is no way to overlay the price information for different days or months.

Pros:
No serious (irreversible data errors) errors can be made.

Cons:
As mentioned above, the interface is more likely to cause mode errors.

->
Bob decides to change the conditioner's set point. He clicks the "Config Device" button to edit the settings of A/C1. A/C1's settings screen enables Bob to edit the set point.
Bob increases the set point from 75 degrees to 80 degrees and clicks the OK button.

Pros:
The interface provides an intuitive way to access the settings of the selected device.

Cons:
Can confuse new users who want to edit the settings of a specific device, but do not care to view its consumption or usage information.

Pros:
The device settings are easily accessible from the main screen.

The device selection list and the Device Settings button are close to one another.

Cons:
The user has to access the device specific view (i.e. select the device from the list) in order to be able to edit its settings.

Pros:
Setting the set point too high or too low may result in too much energy consumption or overheating or over-cooling the house or office.

Cons:
As mentioned above, the interface is more likely to cause mode errors (such as viewing the settings for the wrong device).

Bob checks the status of his solar panels, by clicking the device list and selecting the Solar Panels option.
 

Pros:
Same as above (see row 2).

Cons:
Same as above (see row 2).

Pros:
Same as above (see row 2).

Cons:
Same as above (see row 2).

Pros:
Same as above (see row 2).


Cons:
Same as above (see row 2).

Bob checks the generated power information by clicking the Power tab below the graph. The app displays a graph showing information about the power generated by the solar panels. He decides to sell some power back to the utility company, so he clicks the Sell Power button.
 

Pros:
The interface provides an easy and intuitive way to the generated power information, accessible from all the different data view modes. New users can easily access this feature without getting lost.

The graph view provides a clear way to view the generated power info, even for new users.

Cons:
New users may find the tabs a bit confusing.

Consumer appliances and Generator appliances do not have the same view options. New users may find this a bit confusing.

Pros:
Quick and easy access to the generated power information.

Cons:
There is no way to overlay the energy generation patterns for multiple devices (the user views only one at a time).

Pros:
No serious (irreversible data errors) errors can be made.


Cons:
As mentioned above, the interface is more likely to cause mode errors (such as viewing the settings for the wrong device).

Mode errors may cause the user to make the wrong decisions (such as scheduling transaction for the wrong generator after viewing the graph for the wrong power generator appliance)

The app displays the Sell Power screen, showing a list of all the future transactions scheduled to sell extra power generated by the solar panels.
Bob creates an additional transaction by clicking the +add button.

Transactions can also be edited and deleted. The user can edit a transaction by clicking it (clicking the list item representing the transaction). 

The dropdown on the top right corner enables the user to view scheduled transactions for different devices. The user can change the device for which they view and schedule transactions by clicking the dropdown and selecting a different device. The dropdown only lists Generator appliances (e.g. solar panels or power generators)
 

Pros:
The interface resembles the android phone's alarm clock setting interface.

Cons:
Users who are unfamiliar with this type of interface may find this a bit confusing, especially editing.

Pros:
Quick and easy access to the different Generator appliances, without having to go back to the main screen.

The interface also provides a quick and easy way to create and edit transactions.

Cons:
A large number of future transactions make it difficult to find the right transaction to edit (requires a lot of scrolling).

No way to copy transactions from one device to another.

Pros:
The users can view the scheduled transactions and correct any scheduling errors.

Cons:
As mentioned above, the interface is more likely to cause mode errors (e.g. scheduling transactions for the wrong generator device).

Users may accidentally schedule transactions for the wrong time.

Such errors may result in higher costs (e.g. selling too much energy during peak hours when consumption and prices are high).

No undo/redo.

The app displays a dialog that enables Bob to schedule the transaction. Bob creates a transaction scheduled to take place at 4pm (an hour into the future). He sets the start and end time by clicking the time fields and setting the time. Then he saves the transaction by clicking the OK button and closes the application.
 

Pros:
The interface provides a convenient way to edit the start and end date and time of the transaction. It resembles calendar event editing interfaces (the event editing dialog or screen), where the user can change the start and end time.

Cons:
Users who are unfamiliar with these types of interfaces may find it confusing.

Pros:
The interface provides a quick way to set the start and end dates and times of the transaction.

Cons:
There is no way to enter duration instead of end date and the user may have to compute the end date as a result.

The interface requires the user to exit the transaction dialog in order to be able to edit a different transaction or a transaction for a different device.

The interface provides no way to view the other scheduled transactions while adding a transaction.

Since this interface is not presented on the main screen, the user cannot view power generation information while scheduling a transaction, meaning that the user is required to remember roughly how much energy is generated in order to schedule transactions that make sense.

Pros:
The interface only enables the user to enter valid dates (date and time dialogs do that).


Cons:
The interface provides no undo mechanisms.

The user has no way to recover deleted events.

Scheduling transactions for the wrong time or date may result in selling too much energy at the wrong time of the day, which may require the user to pay for energy from external sources during peak hours, instead of using their own personal power generator or battery.

Critiques of the overall design

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