Which of the following is a disadvantage of PECS?

The selected answer highlights a significant disadvantage of the Picture Exchange Communication System (PECS). As individuals build their communication book or system, it can indeed become unwieldy as more pictures are added to accommodate various concepts, requests, and situations. This can make it cumbersome for the user, leading to potential difficulties in accessing the needed symbols quickly during communication exchanges.

Moreover, as the collection of pictures expands, the organization of the system may become more complex, requiring careful management to ensure that the user can efficiently communicate their needs. This complexity can also lead to frustration for both the user and the communication partner, ultimately hindering effective interaction. In contrast, while the other options reflect some benefits of PECS, they do not represent disadvantages, highlighting how they are not pertinent to the question regarding disadvantages of the system. For instance, the design of PECS aims to make communication accessible, which aligns with the notion that it is simple and inexpensive, as well as promoting verbal communication as users work towards talking as they grow more proficient in using the system.