1. AAC:Group Presentation One Kristen Eklund & Jolene Hyppa Martin

2. Selection Methods Step Scan

3. Selection Methods • enable a switch user to ‘scan’ and ‘select’ from a set of items using one or more switches

4. Step scan • highlighter moves (steps) along just one item when you press the switch - holding down the switch has no effect. • to move to the next item you must release the switch and then press it again • the highlighted item can be selected in one of two ways depending on how many switches you are using

5. Step Scan • 1-SwitchStep Scan • dwell selection is used - the item is selected by releasing the switch for a pre-defined time. • 2-Switch Step Scan • one switch is used to scan to the required item • the second switch is used to select it.

6. 2-Switch Step Scan • often used to introduce someone to the principles of scanning: • no need to worry about pressing or releasing the switch within a certain time • the highlighter only moves once for every switch press, even if the user keeps the switch pressed. • simple to understand because one switch always moves the highlighter and the other always selects the highlighted item

7. 1-Switch Step Scan is recommended when: • User can repeatedly press and release the switch • quick repeats may be needed to avoid dwelling on an item and selecting it by mistake • User becomes anxious waiting topress the switch for Autoscan

8. 2-Switch Step Scan is recommended when: • User can control two switches • User cannot hold or release the switch with good timing (so Userscan is not suitable) • User has difficulty waiting and pressing the switch with good timing (so Autoscan is not suitable) • User has learning difficulties

9. Demonstrations: • 1-Switch Scan Step • 2-Switch Scan Step

10. Our Comments on Step Scan • Easy to use • Good demos • Functional • Relatively easy to determine which is better for client

11. Scan Movements Nested Scan

12. Scan Movements • the way that the highlighter moves as items are scanned on the screen

13. Nested Scan Movement • means that a group may contain one or more sub-groups, and in turn each of these sub-groups can contain more groups • the selection set is scanned in smaller and smaller groups until the desired item is reached • nesting is very useful for sub-dividing a large number of items into several small groups of related items • it is faster than other types of scanning because fewer irrelevant items are highlighted so less selections are made

14. Demonstration: • Nested Scan

15. Our Comments on Nested Scan • Ineffective and confusing demo • Would be helpful in many cases to decrease number of selections required • Our example: • Yard, Garage, House • Cleaning products, Rooms, Furnishings… • Lysol, Comet, Mop, Broom, Duster, Furniture Polish… • This way the user has access to many specific items, and doesn’t have to page through numerous items to get there • Reduces selections • Saves time • Needs to understand semantic relationships

16. Simtech Switch Programs • Relating to step scanning & nested scan movement

17. “Scan & Match Series” Description: Picture matching Function: Used to establish cause & effect with users Step Scanning Programs

18. “Picasso Series” Description: Drawing and painting pictures Function: Also used to establish cause and effect Step Scanning Programs

19. “Switch Wars” Description: Arcade-style game featuring spaceships and aliens Function: Teach cause and effect Step Scanning Programs

20. Nested Scan Movement Programs • Nothing specific for nested scan • Any category game would be great