Table 1: Synoptic representation of the reviewed studies on communication.

Studies 2015

Participants

Range Age

AT

Targeted Behaviors

Outcomes

Copple et al. [22]

3

3.5-5

SGD

Request and Choice

Three positive

Couper et al. [23]

9

4-9

SGD

Manual Signs

Five positive

Kasari et al. [24]

61

5-8

SGD

Communicative Skills

Sixty one positive

Flores et al. [25]

5

6-10

I - Pad and Cards

Communicative Skills

Two negative

Ganz et al. [26]

2

4-5

Verbal modelling and PECS

Verbal Requests

Two negative

Yoder & Liberman [27]

36

1.5-5

PECS and Pre - linguistic milieu teaching

Coordinated Attention

Thirty six positive

Franco et al.  [28]

1

7

SGD

Vocal Utterances

One positive

Ganz et al. [29]

3

6-9

PECS

Requests Words

Three positive

Son et al. [30]

3

4-5

PECS and VOCA

Requesting Behaviour

Three positive

Sigafoos et al. [31]

2

12-16

SGD

Requests Behaviour

One negative

Sigafoos et al. [32]

1

12

SGD

Request Objects

One positive