Table 3.

Verbatim instructions accompanying Fig. 7 (Task 1, complex–simple condition).

Chunked group	Interleaved group
In this task you will see screens that look like this (SHOW)	In this task you will see screens that look like this (SHOW)
In some screens there are vehicles, like this one (SHOW). The first step is to select one of the four pictures on the screen. To do that, you first look at the centre of the screen. The symbol is a − or a + sign. If it is a −, you look at the vehicles on the left half of the screen, while for a +, you look to the right. Now, on the selected side, you see a motorbike and a car. You should select the bike. (POINT)	In some screens there are vehicles, like this one (SHOW). The first step is to select one of the four pictures on the screen. To do that, you first look at the centre of the screen. The symbol is a – or a + sign. If it is a −, you look at the vehicles on the left half of the screen, while for a +, you look to the right. Now, on the selected side, you see a motorbike and a car. You should select the bike. (POINT)
The second step is to select one of the boxes below the selected picture. Below the vehicle, you will see a pair of letters (POINT). You should select the lower case letter (POINT)	In other screens, there is a single book so it is already selected. The book can appear in various locations
Finally, the third step is to make a response. It works like this: Normally, you touch the lower case letter, except that occasionally, just beneath the lower the lower case letter you see a dot. When this happens, you should touch the dot instead of the letter (POINTING THROUGHOUT)	The second step is to select one of the boxes below the selected picture. Below the vehicle, you will see a pair of letters (POINT). You should select the lower case letter (POINT). Below the book, you will see a pair of lines (POINT). You should select the horizontal line (POINT)
In other screens, there is a single book so it is already selected. The book can appear in various locations	Finally, the third step is to make a response
The second step is to select one of the boxes below the selected picture. Below the book, you will see a pair of lines (POINT). You should select the horizontal line (POINT)	For vehicles, it works like this: Normally, you touch the lower case letter, except that occasionally, just beneath the lower the lower case letter you see a dot. When this happens, you should touch the dot instead of the letter (POINTING THROUGHOUT)
Finally, the third step is to make a response. It works like this: Normally, you touch the horizontal line, except that occasionally, just beneath the horizontal line you see the letter T. When this happens, you should touch both the horizontal and vertical line (in that order) instead of just the horizontal line (POINTING THROUGHOUT)	For books, it works like this: Normally, you touch the horizontal line, except that occasionally, just beneath the horizontal line you see the letter T. When this happens, you should touch both the horizontal and vertical line (in that order) instead of just the horizontal line (POINTING THROUGHOUT)