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etadd_47(3) - Division on Autism and Developmental Disabilities

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TABLE 3<br />

Examples of Types of Problems Used <strong>on</strong> Pretest, Posttest, <strong>and</strong> Maintenance Check<br />

the two groups of students with regard to their<br />

pretest (F [1, 8] .20, p .67), IQ scores (F<br />

[1, 8] .32, p .58), or age (F [1, 8] 2.42,<br />

p .16).<br />

A program instructor who had two years<br />

of experience teaching functi<strong>on</strong>al life skills<br />

delivered the strategy instructi<strong>on</strong> to the<br />

experimental group three times a week<br />

(i.e., M<strong>on</strong>day, Wednesday, <strong>and</strong> Friday) during<br />

the regularly scheduled class time. Each<br />

less<strong>on</strong> lasted for approximately 30–35 minutes.<br />

The total durati<strong>on</strong> of the interventi<strong>on</strong><br />

was two weeks (i.e., six less<strong>on</strong>s). During the<br />

interventi<strong>on</strong>, students in the comparis<strong>on</strong><br />

group attended their regularly scheduled<br />

classes.<br />

Materials<br />

Problem type Example<br />

Target item Mike had a dinner at a restaurant <strong>and</strong> the bill was $35.63. He paid the bill with<br />

additi<strong>on</strong>al 15% for the tip.<br />

(a) How much was the tip?<br />

(b) How much did he pay in total?<br />

Generalizati<strong>on</strong> Item<br />

Different c<strong>on</strong>text The price for a can of soda is $2.99 <strong>and</strong> the sales tax is 6%.<br />

(a) How much is tax?<br />

(b) How much total will you pay for the soda?<br />

Different operati<strong>on</strong> The book is <strong>on</strong> sale for 20% off. The price for the book you want to buy is $20.00.<br />

(a) How much m<strong>on</strong>ey will you save from the sales?<br />

(b) How much is the book now?<br />

Different value Your bill for your dinner is $127.56 <strong>and</strong> you really enjoyed the service. You want to<br />

give the waiter a 20% tip.<br />

(a) How much is the tip?<br />

(b) How much is the total you will pay?<br />

We developed three equivalent probes for the<br />

pretest, posttest, <strong>and</strong> maintenance check.<br />

Each probe c<strong>on</strong>tained 16 items including<br />

(a) 10 target items that assessed students’<br />

ability to calculate tip <strong>and</strong> total bill in a variety<br />

of situati<strong>on</strong>s (e.g., restaurant, delivery, taxi<br />

fare) <strong>and</strong> (b) six generalizati<strong>on</strong> items that<br />

assessed students’ ability to solve problems<br />

using percentages in a different c<strong>on</strong>text<br />

(e.g., calculate sales tax), requiring different<br />

operati<strong>on</strong> (e.g., calculate sales price), or using<br />

different percentage values. Table 3 presents<br />

examples of each type of problem <strong>on</strong> the<br />

three tests. Each target <strong>and</strong> generalizati<strong>on</strong><br />

item <strong>on</strong> the probes c<strong>on</strong>tained two questi<strong>on</strong>s<br />

that were related to the two steps of the problem<br />

soluti<strong>on</strong>. Therefore, the total available<br />

number of problems from the target items was<br />

20 <strong>and</strong> 12 from the generalizati<strong>on</strong> items. The<br />

order of the different types of items <strong>on</strong> the<br />

tests was r<strong>and</strong>omized (Case et al., 1992). We<br />

also developed additi<strong>on</strong>al worksheets that<br />

<strong>on</strong>ly c<strong>on</strong>tained target items for guided <strong>and</strong><br />

independent practice during the interventi<strong>on</strong>.<br />

General Procedure<br />

The instructor of the course delivered the<br />

interventi<strong>on</strong> to the experimental group using<br />

the scripted less<strong>on</strong> plans developed by the<br />

researcher. Each scripted less<strong>on</strong> plan included<br />

a step-by-step protocol, teacher wording,<br />

examples, student worksheets, <strong>and</strong> overhead<br />

transparencies. Before each less<strong>on</strong>, the<br />

researcher <strong>and</strong> the teacher went over the less<strong>on</strong><br />

plan together <strong>and</strong> simulated the teaching<br />

process using the script.<br />

Each less<strong>on</strong> followed the structure of an<br />

explicit instructi<strong>on</strong> less<strong>on</strong>. For example, the<br />

teacher began each less<strong>on</strong> with a review of the<br />

previous less<strong>on</strong> <strong>and</strong> a descripti<strong>on</strong> of the learning<br />

objectives <strong>and</strong> expectati<strong>on</strong>s. Following the<br />

348 / Educati<strong>on</strong> <strong>and</strong> Training in <strong>Autism</strong> <strong>and</strong> <strong>Developmental</strong> <strong>Disabilities</strong>-September 2012

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