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Why is usability important?

it makes the differences between performing a task accurately and completely or not, and enjoying the proses or being frustrated

determine the success or failure of a system

Poor usability…

Reduce productivity

Increase cost time and effort

Usability Engineering

USABILITY

The term usability engineering describes a process of user interface development, sometimes referred to as user centred design.

It is a lifecycle process that puts an early emphasis on user and task analysis and actual user involvement in the design and testing of a product.

A product developed with such a user centred process is likely to be a more usable product than one that is developed independent of user considerations and involvement.

The extent to which a prUsability oduct can be used by specified users to achieve specified goal with effectiveness, effiency and satisfication in a specified context of use

According to Jakob Nielsen (2003), usability is defined by 5 quality components :

Learnability : ease of learning for novice users.

Efficiency : steady-state performance of expert users.

Memorability : ease of using system intermittently for casual users.

Errors : error rate for minor and catastrophic errors.

Subjective Satisfaction : how pleasant the system is to use.

Usability engineering lifecycle

  • Identify user requirements and problems

Profile Users

Task Analysis

  • Identify usability goals based on user requirements
  • Checkout similar products
  • Design and prototype a solution (involve users)
  • Evaluate prototype

Usability testing (real users and real tasks)

  • Reiterate steps 4-5 …until users are satisfied

FP511-HUMAN COMPUTER INTERACTION (USABILITY ENGINEERING)

LECTURER NAME: PUAN MAZ AZLEENA BINTI AZAHARI

students name:

NUR SERI ANIS BINTI ABDULLAH 10DIP11F1038

FHATIN SYAHIRRA SHEYREEN BINTI MUSA 10DIP11F1060

THURKA DEVI A/P J DAVARAJU 10DIP11F1036

NORFAEZAH BINTI ABU BAKAR 10BIP11F2018

23/1/2013

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