BY:C.MADHUMATHI,II MCA “B” SEC,

08MCA54

ContentsProduct Accessiblity

1. Introduction

2. Text Equivalents –Audio,Video,Images

3. Low Vision

4. Style sheets

5. Numerous Colors

6. Reduce flicker rate,speed of moving text avoid flashes and blinking

7. Mobility impaired users

8. Conclusion

9. Summarize

10. References

INTRODUCTION• “ Product Accessibility”- Providing accessibility in the product

through standards and guidelines .Product- should do everything -ensuring the basic accessibility features - utilized by it.

• Designing of product’s user interface: 1. Good understanding of basic accessibility features. 2. Requirements of different types of users with special needs. 3. Categories of users, their abilities and challenges. • Help from various websites• Accessibility standards - 508 and W3C refer to a complete set of

requirements .

TEXT EQUIVALENTS HAVE TO BE PROVIDED FOR AUDIO, VIDEO AND

PICTURE IMAGES Accessibility Impaired users Visually Impaired Hearing Impaired Mobility Impaired product - all kind of users - must have

certain accessibility tools eg. narrator

EXAMPLES

PEOPLE WITH LOW VISION• see the pages in extra-large fonts - use the

product comfortably.• product expecting a particular resolution, font size

display all fields on the screen - usability issues.

Hello EverybodyHello everybody

•adequate spacing between the fields and text -messages

appearing on the screen do not look cluttered - font size is

increased.

Contd………

Hello EverybodyHello EverybodyHello EverybodyHello EverybodyHello Everybody

STYLESHEETS

• STYLESHEETS - Documents and fields should be organized so that they can be read without requiring a particular resolution of the screen, and templates

• Normally, Information on web pages - displayed on the screen using templates (STYLE SHEETS)

TYPES OF STYLESHEETS

Stylesheets

Internal StylesheetsEg. MS-word

External StylesheetsEg. pdf

Explanation of the types of Stylesheets

• Internal Stylesheets: Hard coded sheets that dictate the fields, size and their

positions on the screen. This creates problems for users when they want to adjust

the windows and size of fonts.

• External Stylesheets: It is the safest method. The programs written for the product should not tamper

with user-defined external style sheets.

Problems in identifying numerous colors

Color Blindness:

Product using color text, color pictures and color screens should not use color as the sole method of identification of user interface elements.

User interfaces should be designed so that all information conveyed with color is also available without color.

EXAMPLEPress the green button to start the program.

you can use the red button to stop the running program

CONTINUE STOP

Reduce flicker rate, speed of moving text, avoid flashes and

blinking text• Different people read at different speeds.• People with below-average speed in reading -find

it irritating to see text that is blinking, flashing as it further impacts reading speed.

• People with good vision -find the flashes, flickers beyond a particular frequency -uncomfortable.

• The flickers should be between the frequencies of 2 Hz and 55 Hz, as defined by some of the usability standards.

ExamplesReduce flicker rateHello everybody

Reduce speed of moving text

Avoid flashes and blinking text

Hello everybodyHello everybody

Va maa minnal…Va maa minnal...

God is now here

Persons with mobility-impaired users and nerve-related

problems• Cannot move the eyeballs as fast as others.• Health problems - prevent them from

reading as fast as others.• Rolling and moving Text: Speed at which the text rolls or moves -

compatible with the reading capability of the slowest product user.

The product - feature to alter the speed of moving text.

….contd• Physical movement - to use the

product – minimized - assisting mobility impaired users.

• Spreading user interface elements to the corner of the screens - avoided -

require the users to move the pointing devices to the corners,

involving effort.

ExamplesName Register no

Dept Location

C.Madhumathi

MCA

08MCA54

Trichy

• individual screens and entire set of screens in totality - designed keeping minimum movement requirements in mind.

• multiple screens are used in performing a set of operations - the corresponding sequence of positive responses - CONTINUE, ACCEPT BACK,EXIT buttons - aligned across screens - the pointing devices - not realigned when the screen changes.

• User interfaces - expect users use fewer devices -regular operations.

• Using the keyboard is essential - information to be typed - using a pointing device may be avoided - <TAB> key used to navigate among the fields.

• Mixing the use of several devices - keyboard and mouse increases the complexity of user interface.

• Reduce physical movement requirements for the users - designing the interface - allow adequate time for user responses.

Examples

Name C.Madhumathi

Reg. No. 08Mca54

Department MCA

Location Trichy

TIMED RESPONSE• When a timed response is required,

the user should be alerted and given sufficient time to indicate that more time is required.

• Some users require more time to think and act, as they may be challenged in more fashion.

Click on this ok button within 5 seconds if information is correct

conclusion• The sample requirements given are some

examples to improve accessibility.• There are many more requirements like these and

they are normally classified on the basis of the technology used for providing the user interface. (for eg, web-based interface, client-based interface and so on) in the popular standards (such as 508 guidelines) defined for accessibility.

• Selecting the right standard for the technology used in the interface will go a long way in improving accessibility.

Summarize• Providing accessibility in the product through

standards and guidelines is called product accessibility.

• Text equivalents - audio, video and picture images.• style sheets.• User interfaces - designed -informations conveyed

with color & without color.• Reduce flicker rate, speed of moving text, avoid

flashes and blinking text.• Reduce physical movement requirements -

designing the interface & allow adequate time for user responses.

• 508 and w3c –accessibility standards

References

• “software Testing”-principles and practises by srinivasan Desikan and Gopalaswamy Ramesh.

• www.w3c.org• www.w3c.com

THANK

YOU