effectiveness

toc =Effectiveness=

Introduction
It is a metric in the IMPACT acronym used to denote the ability to meet certain goals set out by the designer and user groups. The product/service rendered must satisfy certain requirements and the cost/benefit analysis.

Example
When using a computer to do graphics in the Adobe Creative Suite, one expects that this computer have the capabilities to use this software if so the computer is effective. Certain requirements might entail, a graphic card, a sufficient amount of RAM, and a good monitor.

Purpose
Effectiveness is one of the usability goals that refers to the ability to complete a desired task or accomplish a purpose producing the intended or expected results. Effectiveness covers the usability principles of navigation, control, feedback, recovery, and constraints.

Elements
Effectiveness involves two major components, acceptability and productivity. Acceptability ensures that a system is adequately capable of satisfying a need, requirement, or standard that fits in with a person’s way of working. The more feedback and people involved in the designing of a system, the more likely it will have a higher acceptability among users. Productivity refers to a systems ability to produce, generate, or create what it is intended to.

Usability Principles

 * **Navigation** is the ability for users to locate and move around parts of the system. Ex. Maps, site maps, directional signs and information signs.
 * **Control** is enhanced if there is a clear and logical mapping between controls and the effect that they have.
 * **Feedback** states or explains the effects of a user's actions. Consistent feedback provides the user with a stronger feeling of control.
 * **Recovery** is useful after an error/mistake is made or the system is interrupted. The user can always return to his/her original state quickly and effectively without loosing infromation
 * **Constraints** are restrictions provided so that people do not try to do things that are inappropriate. It is a preventative measure disabling people from making serious errors through properly contraining allowable actions and seeking consent for dangerous operations.