Analysis

Efficiency: The design allows the user to get started very quickly by immediately typing in the event they are looking for upon arriving to site.
Efficiency: All of the steps needed to go from searching for an event to seeing who else wants to carpool for that event occur within one page.
Efficiency: Minimal investment is required since signing in or signing up is only requested after the user has found the event that for which they want to carpool.
Efficiency: The tab structure allows the user to quickly switch between different tasks.

Learnability: Some users may not understand what the various UI input fields are asking for since the design lacks dense descriptions or pictures.
Learnability: With so many options in one place to promote efficiency, beginners may not find the UI intuitive.
Safety: Since Since the form does not use multiple pages, the users will lose all of their entered information if they accidentally press the back button.

Efficiency: The design allows the user to get started very quickly by immediately typing in the event they are looking for upon arriving to site.
Efficiency: All of the steps needed to go from searching for an event to seeing who else wants to carpool for that event occur within one page.
Efficiency: Minimal investment is required since signing in or signing up is only requested after the user has found the event that for which they want to carpool.
Efficiency: The The tab structure allows the user to quickly switch between different tasks.

Learnability: Some users may not understand what the various UI input fields are asking for since the design lacks dense descriptions or pictures.
Learnability: With so many options in one place to promote efficiency, beginners may not find the UI intuitive.
Safety: Since the form does not use multiple pages, the users will lose all of their entered information if they accidentally press the back button.

Learnability: Simple interface
Efficiency: Sign in only has to happen once
Efficiency: Since this does not offer the full capability of the web style, the few options are very quick to get to and fast to utilize
Safety: Easy to navigate between tabs/activities
Safety: Few options to make errors with

Efficiency: Unable Unable to complete all tasks from web style
Safety: Because Because some buttons are so easily accessible, they may be pressed accidentally. (It might be troublesome if you accidentally press “I can’t make it,” for example.)
Safety: Since Since the form does not use multiple pages, the users will lose all of their entered information if they accidentally press the back button.

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