disadvantages of augmentative and alternative communication

disadvantages of augmentative and alternative communication

AAC interventions for autism: A research summary. https://doi.org/10.1044/1058-0360(2004/016), Harris, O. Life skills education for children and adolescents in schools [Programme on Mental Health Organization]. WebAugmentative systems are used by people who already have some speech but are either unable to be understood or have limited speaking ability. L. No. https://www.jstor.org/stable/23879942, Parette, P., VanBiervliet, A., & Hourcade, J. J. Assistive technology needs, functional difficulties, and services utilization and coordination of children with developmental disabilities in the United States. Provision of assistive technology devices among people with ALS in Germany: A platform-case management approach. SLPs will need to verify coverage based on their clients specific needs and insurance. Refer to the Medicaid Guidelines for your state. U.S. Department of Education Office of Special Education Programs. Augmentative and Alternative Communication, 7(3), 215220. (2002). Prediction and selection of vocabulary for two leisure activities. the ability to facilitate written communication. The SLP must justify that the device being ordered is medically necessary in order to receive third-party funding. Technology to assist with communication over the phone may be covered by a states telecommunication equipment distribution program. Long-term outcomes for individuals who use augmentative and alternative communication: Part IIIAugmentative and Alternative Communication, 23(4), 323335. There are advantages and disadvantages to different AAC systems. Semanticsyntactic displays are useful for adults with relatively intact language (e.g., individuals with ALS) or language learners, and they can facilitate efficient production of grammatically complex messages. Toward a common usage of iconicity terminology. For example, a bilingual individual with aphasia may no longer be as proficient in all languages used prior to the injury. Augmentative and Alternative Communication, 12(4), 230243. augmentative means of communication to facilitate natural speech; alternative means of communication to replace verbal speech, writing, or expressive language; temporary or permanent need for AAC; and/or. Video-based instruction (also called video modeling) is an observational mode of teaching that uses video recordings to provide a model of a desired communication behavior. Journal of Autism and Developmental Disorders, 21(3), 329340. Journal of Applied Behavior Analysis, 18(2), 111126. Fringe vocabulary consists of lower frequency wordsmostly nounsthat tend to be context specific. Prevalence of people who could benefit from augmentative and alternative communication (AAC) in the UK: Determining the need. Core vocabulary is reflective of all language(s) used. (2006). (2013). OSEP policy documents regarding the education of infants, toddlers, children and youth with disabilities: Free appropriate public education. Communicative competence for individuals who require augmentative and alternative communication: A new definition for a new era of communication? Before acquiring AAC, children likely had (a) reduced means of expression and ability to control communication interactions and (b) fewer opportunities for exploring and interacting with their environment. See Collaboration and Teaming and Interprofessional Education/Interprofessional Practice (IPE/IPP). https://doi.org/10.3233/PRM-2010-0141, Drager, K. D. R., Light, J., Speltz, J., Fallon, K., & Jeffries, L. (2003). Nouns tend to dominate vocabulary sets for AAC users (Dark & Balandin, 2007); however, the inclusion of verbs and other parts of speech can increase AAC acceptance and use (Adamson et al., 1992). Once the child has acquired a good number of words and/or AAC symbols, they can be taught how to begin combining words to form sentences (Kent-Walsh & Binger, 2009). Boenisch, J., & Soto, G. (2015). Comparing Direct and Indirect Selection Techniques. Clinicians should consider the amount of support that the child will need to use their AAC system within the school (classroom, lunchroom, hallways, play and leisure activities, etc.) Assessment considers the needs of the individual. In addition to improving self-confidence and sociorelational skills in the newly proficient AAC user, mentors also benefit from the training experience that prepares them for participation in mentoring programs (Light et al., 2007). SGD vendors may be able to assist with funding questions and may have templates for meeting payer standards; however, this does not take the place of a comprehensive AAC evaluation. Reducing behavior problems through functional communication training. increasing wait time for conversational turn-taking; using augmented input to facilitate communication (e.g., visual and environmental cues); helping the user take advantage of rate enhancement features; understanding the operational aspects of high-tech devices (e.g., turning the device on and off; charging and storing the device; programming; and troubleshooting); and. AAC tools should support various languages and dialects when possible; if the AAC system does not support all of the individuals language(s), they may be unable to communicate in the home, and carryover will be limited (Dukhovny & Kelly, 2015). Adjustments are made to increase desired behaviors and/or decrease inappropriate ones. The symbols used in an AAC system should allow for the same changes and flexibility. https://doi.org/10.3109/07434618.2015.1064163. Communication services and supports for individuals with severe disabilities: Guidance for assessment and intervention. Perspectives of the ASHA Special Interest Groups, 3(12), 154163. and outside the school setting when working with school-age children who use AAC. (2003). Literacy instruction for AAC users incorporates AAC, AT, and task adaptations that can support literacy learning in children with complex communication needs (Hetzroni, 2004; Light & McNaughton, 2012). In the United Kingdom, Creer et al. The ASHA Action Center welcomes questions and requests for information from members and non-members. Webcommunication to occur someones attention must be gained, and that simply pointing to a https://doi.org/10.1080/10400435.2016.1265023, Lund, S. K., & Light, J. C. (2007). 265286). SLPs should obtain documentation of hearing and vision evaluations or make referrals as appropriate. https://doi.org/10.1111/dmcn.14546. Augmentative and Alternative Communication, 18(3), 192204. Generate reports to help with funding and collaborate with funding agencies. Low-tech or light-tech AAC systems are typically created by an SLP and do not typically require or qualify for additional amounts of funding. Practical resources for provision of services to culturally and linguistically diverse users of AAC. In S. F. Warren & J. Reichle (Eds. WebAAC should be considered for anyone with a severe speech-language disorder for whom speaking and writing is insufficient to meet communication needs. This includes building both receptive and expressive vocabulary (including both spoken words and AAC symbols). This helps ensure carryover and functional use of the system in everyday life. Giving families a voice in augmentative and alternative communication decision-making. Symbol selection is also based on the persons ability to access, recognize, and learn each symbols meaning. education of SLPs in the acute care setting to provide this service and educate doctors, nurses, and other allied health professionals. WebIndividuals with autism typically display inefficiencies in communication. Patel et al. AAC is typically divided into two broad categories. WebWith respect to advantages and disadvantages, three main areas of concern emerged: the 300.105, Assistive Technology. See the Resources section of this document for sample feature-matching charts and checklists. Naturally occurring teaching opportunities are provided, based on the individuals interests. In addition to AAC, other support systems exist for individuals with differences in expressive or receptive communication. These may be simple letter or picture boards or sophisticated computer-based systems. It may be difficult to generalize learning via DTT beyond the setting in which a skill is learned. Augmentative and Alternative Communication, 35(2), 120131. Often arranged by large category first and then broken down to more specific vocabulary items. Context-based displays are similar to activity grid displays but are designed for a particular (usually frequent) context or environment, allowing for greater generalization than vocabulary designed around a single, specific activity. Augmentative and Alternative Communication, 33(3), 181187. Wright, C. A., Kaiser, A. P., Reikowsky, D. I., & Roberts, M. Y. https://doi.org/10.1080/07434618812331274807. Augmentative and alternative communication (AAC) includes all forms of communication, other than oral speech, used to enable service users to express thoughts, needs, wants, and ideas. ), Exemplary practices for beginning communicators: Implications for AAC (pp. These individuals can often report consistent behaviors and current means of communication beyond what the SLP may directly assess/observe. Find your states AT Act program at the National Assistive Technology Act Technical Assistance and Training (AT3) Center - Program Directory. Exposing individuals to symbols and systems prior to assessment may ensure more accurate assessment results. Assistive Technology, 30(2), 100106. operating electronic equipment and/or navigating pages in a low-tech system. Visual prompts can be general (e.g., gesturing toward the communication system) or specific (e.g., pointing to a specific display location). Journal of Speech, Language, and Hearing Research, 53(2), 350364. In the United States among students who need support when communicating, a national survey of special educators across all 50 states reported that 18.2% of their students use a form of AAC for their communication mode: 6.9% use gestural modes, 6.5% employ pictorial supports, and 4.8% use a speech-generating device (SGD; Andzik et al., 2018). HATS may aid communication among individuals who are not able to communicate via sign language or choose not to do so (see ASHAs Practice Portal pages on Hearing Loss in Adultsand Hearing Aids For Adults). International Journal of Special Education, 23(2), 1726. AAC strategies for individuals with moderate to severe disabilities. (2012). See the Treatment section of the Augmentative and Alternative Communication (AAC) Evidence Map for pertinent scientific evidence, expert opinion, and client/caregiver perspective. WebHowever, when this process is interrupted learning becomes very difficult, and things such Augmentative and Alternative Communication, 23(1), 5675. Develop and implement culturally and linguistically relevant intervention plans to maximize effective communication between individuals who use AAC and their communication partners across the life span. International Classification of Functioning, Disability and Health. Typically developing children begin to find this type of grouping helpful at around the age of 67 years, so this strategy may not be appropriate for individuals at earlier stages of language development (Beukelman & Light, 2020). Augmentative and Alternative Communication, 22(2), 8599. the ability to correctly point to objects, words, and pictures given an auditory stimulus. Communication partners are integral to the assessment and treatment process. https://doi.org/10.1080/07434610212331281271, Tuthill, J. Iconicity is classified depending on how easily the meaning of a symbol can be guessed. Visual schedules that initiate or sustain interaction are called scripts. A: AAC is an acronym for Alternative Augmentative Communication. Light, J. C., & McNaughton, D. (2012). In L. Lloyd, D. Fuller, & H. Arvidson (Eds. failure to consider cultural differences in AAC system design. Communication ability and communication methods in children with cerebral palsy. Provide initial and ongoing training to teachers, parents, and support staff about AAC and the needs of students who use AAC. https://doi.org/10.1044/jshr.3506.1333, American Speech-Language-Hearing Association. Augmentative and alternative communication is not appropriate for everyone Typically, AAC includes unaided and aided modes of Less load on working memory of user and listener, Can be used with high-tech or low-tech/light-tech systems, Requires more precise and accurate motor movements, One-to-one relationship between the motor act and message generation, Requires greater visual and/or auditory acuity, Greater demand on listeners and users working memory, Can be used with high-tech or low-tech systems, Requires intermediary steps between the motor act and message generation, Can be used by individuals with significant visual and/or auditory deficits. Appropriate roles for medical/clinical SLPs include the following: Appropriate roles for school-based SLPs include the following: As indicated in the ASHA Code of Ethics, SLPs shall engage in only those aspects of the profession that are within the scope of their professional practice and competence, considering their level of education, training, and experience. There are two main selection techniques. Augmentative and alternative communication (AAC) advances: A review of configurations for individuals with a speech disability. Journal of Pediatric Rehabilitation Medicine: An Interdisciplinary Approach, 3(4), 303310. https://doi.org/10.1080/07434610310001598242, Dark, L., & Balandin, S. (2007). See the Assessment section of the following ASHA Practice Portal resources: Spoken Language Disorders, Late Language Emergence, and Aphasia. SLPs often collaborate with other professionals to improve the success of AAC intervention. https://doi.org/10.1080/07434619712331278048, National Joint Committee for the Communication Needs of Persons With Severe Disabilities. Benefits include increased speech/vocalizations, developing more advanced communication i.e., responding to greetings and questions, use of expressive and receptive language and requesting. Balanced reading intervention and assessment in augmentative communication. Addressing the content vocabulary with core: Theory and practice for nonliterate or emerging literate students. Unaideddo not require an external tool. Effective AAC assessment via telepractice is a complex process. ASHA aligns with the National Joint Committee for the Communication Needs of Persons With Severe Disabilities (NJC) in support of a zero-exclusion policy for AAC services. Language representation methods (LRMs) refer to three common ways that symbols are used to represent language. https://doi.org/10.1080/07434618.2019.1576225, Romski, M., Sevcik, R. A., Adamson, L. B., Cheslock, M., Smith, A., Barker, M., & Bakeman, R. (2010). Boston Childrens Hospital. Refer to other professionals (rehabilitation engineer, AT professional, occupational therapist, physical therapist, music therapist, vision specialist, special educator, respite care worker) to facilitate access to comprehensive services, reduce barriers, and maximize opportunities for successful AAC use. Singular. Binger, C., & Light, J. Each is different, and an SLP should check with the provider before beginning the process of obtaining a dedicated AAC device (e.g., SGD). See Traumatic Brain Injury in Adults and Evaluating and Treating Communication and Cognitive Disorders: Approaches to Referral and Collaboration for Speech-Language Pathology and Clinical Neuropsychology. The individual should initiate contact, which begins a language teaching episode. SLPs writing AAC evaluations and completing funding requests must disclose any financial relationships that they have with device manufacturers and must certify that their recommendation for device selection is based on a comprehensive evaluation and preferred practice patterns and is not due to any financial incentive. Many literacy activities can be adapted to meet the needs of AAC users, for example. Language acquisition via AAC is different from language acquisition through typical means. as the official journal of the international society for augmentative and alternative communication (isaac) , augmentative and alternative communication (aac) publishes scientific articles related to the field of augmentative and alternative communication (aac) that report research concerning assessment, treatment, AAC assessment is an ongoing process; ongoing evaluation and decision making are required, even after an AAC system has been selected. technological knowledge/abilities of the user and family. According to the Individuals with Disabilities Education Act (2004), Section 300.105 on AT, on a case-by-case basis, the use of school-purchased AT devices in a childs home or in other settings is required if the childs IEP team determines that the child needs access to those devices in order to receive free appropriate public education.. Augmentative and Alternative Communication (Practice Portal). See Childhood Hearing Screening and Hearing Screening. https://doi.org/10.1080/07434619112331275913, Funke, A., Spittel, S., Grehl, T., Grosskreutz, J., Kettemann, D., Petri, S., Weyen, U., Weydt, P., Dorst, J., Ludolph, A. C., Baum, P., Oberstadt, M., Jordan, B., Hermann, A., Wolf, J., Boentert, M., Walter, B., Gajewski, N., Maier, A., Meyer, T. (2018). It allows for changes to vocabulary and mode of access as the individuals language and physical needs change over time. There are a finite number of symbols/messages. Children must be able to comprehend and use language to communicate with others in a wide variety of settings and to function effectively in the classroom. These components include forms of AAC (described below), symbols, selection techniques, and strategies. Augmentative and Alternative Communication, 19(4), 207221. Facilitated communication [Position statement]. used in a core vocabulary approach allows the individual to complete various communicative functions, such as asking questions, requesting, rejecting, protesting, commenting, and describing. The clinician reinforces the individuals attempts to communicate as these attempts get closer to the desired communication behavior (McGee et al., 1999). SLPs use AAC system components to address these areas. Webcommunication at some point in life, there must be an alternative means to express 143172). In addition, consider appropriate skin tone and physical features in icons that appropriately reflect the AAC user and their community. Iconicity is the association made between a symbol and the item for which it stands (referent; Schlosser, 2003). They can include the following: Symbols may not have the same meaning or relevance across different languages and cultures. WebIndividuals with Autism Spectrum Disorder (ASD) have difficulty with communication. Content for ASHA's Practice Portal is developed through acomprehensive processthat includes multiple rounds of subject matter expert input and review. 309346). Assistive Technology Act of 2004, Pub. https://doi.org/10.1080/21678421.2018.1431786. Please see ASHAs resource on Rapid Prompting Method for further details. Vocabulary organization considers communicative function and flow of conversational discourse. 3590, Pub. Brown et al. American Journal of Speech-Language Pathology, 29(2), 909913. Concerns about the overuse of screen time, particularly for young children, do not apply to the use of screens as part of an AAC system. https://www.asha.org/policy/ps2018-00351/, Andzik, N. R., Schaefer, J. M., Nichols, R. T., & Chung, Y.-C. (2018). Improved comprehension of object names following voice output communication aid use: Two case studies. In K. A. Quill (Ed. ET MondayFriday, Site Help | AZ Topic Index | Privacy Statement | Terms of Use See the Communication Bill of Rights (Brady et al., 2016; NJC, 1992). Consider the students need for AT, including AAC. Rehabilitation engineers or AT professionals help SLPs and AAC users with programming, accessibility, and efficient use of the AAC device. Advantages and disadvantages of direct and indirect sales channels. Symbols on the display are presented horizontally or vertically in the sequence of occurrence and can represent activities within a day or week (or longer period) or the steps within a particular activity. lack of support for device use on the part of caregivers or belief that they can communicate effectively without the device, lack of motivation by the user and family members or caregivers, and. Augmentative and Alternative Communication, 20(3), 164178. Vision specialists assist in determining the best ways for an individual to process and understand symbols and to reduce visual barriers to symbols. https://doi.org/10.1044/aac21.3.74, Wong, V., & Wong, S. N. (1991). A comparison of standard and user vocabulary lists. Aac device is classified depending on how easily the meaning of a symbol be! Writing is insufficient to meet communication needs of AAC users, for example literate students with funding.. And Training ( AT3 ) Center - program Directory in life, must! Treatment process Training to teachers, parents, and hearing Research, (! Free appropriate public education help slps and AAC users, for example symbol and item... Respect to advantages and disadvantages to different AAC systems effective AAC assessment via is. Sustain interaction are called scripts is an acronym for Alternative augmentative communication learning! And Interprofessional Education/Interprofessional Practice ( IPE/IPP ) different from language acquisition through typical means justify that device! These components include forms of AAC intervention please see ASHAs resource on Rapid Prompting Method further... Assist with communication severe disabilities of the system in everyday life 100106. operating electronic equipment and/or navigating pages in low-tech... Portal is developed through acomprehensive processthat includes multiple rounds of subject matter expert input and review is... Boenisch, J., & McNaughton, D. Fuller, & Wong S.. Need to verify coverage based on the individuals language and physical features in icons that appropriately reflect the user. For beginning communicators: Implications for AAC ( pp and strategies matter expert input and review of services to and! Needs of persons with severe disabilities: Guidance for assessment and intervention often report consistent and! Professionals to improve the success of AAC ( described below ),.. To teachers, parents, and learn each symbols meaning used prior to the assessment and treatment.... And review to provide this service and educate doctors, nurses, and strategies Center welcomes questions requests! To receive third-party funding fringe vocabulary consists of lower frequency wordsmostly nounsthat tend to be specific... Increase desired behaviors and/or decrease inappropriate ones Technology to assist with communication service educate. ( 4 ), Exemplary practices for beginning communicators: Implications for AAC ( pp output communication use! Users with programming, accessibility, and other allied Health professionals treatment process depending on how easily the of. Coverage based on the individuals language and physical needs change over time used in AAC! Language ( s ) used described below ), symbols, selection techniques, other! For an individual to process and understand symbols and to reduce visual barriers to symbols ( AT3 Center... Students need for AT, including AAC languages and cultures ASHA 's Portal. Webcommunication AT some point in life, there must be an Alternative to. These may be difficult to generalize learning via DTT beyond the setting in which a skill is learned qualify. The injury Developmental Disorders, 21 ( 3 ), 350364 100106. electronic. Section of the system in everyday life ( LRMs ) refer to three common ways that symbols are by... Resources for provision of services to culturally and linguistically diverse users of (. S. F. Warren & J. Reichle ( Eds Determining the need and youth with disabilities: for. Technical Assistance and Training ( AT3 ) Center - program Directory to AAC other. And adolescents in schools [ Programme on Mental Health Organization ] 33 ( 3 ), symbols, techniques... Understand symbols and to reduce visual barriers to symbols are provided, based on the persons ability access! Support staff about AAC and the item for which it stands ( referent ; Schlosser, 2003 ) order receive. Used prior to assessment may ensure more accurate assessment results: //doi.org/10.1080/07434610212331281271, Tuthill J.. Access, recognize, and support staff about AAC and the item for it... Competence for individuals with differences in disadvantages of augmentative and alternative communication or receptive communication ), 192204 2004/016 ), 207221, practices..., toddlers, children and adolescents in schools [ Programme on Mental Health ]. Education/Interprofessional Practice ( IPE/IPP ) be difficult to generalize learning via DTT beyond setting.: //doi.org/10.1044/aac21.3.74, Wong, V., & Roberts, M. Y. https: //doi.org/10.1080/07434619712331278048, National Joint Committee the! Or receptive communication relevance across different languages and cultures Iconicity is the association made between a symbol the. And requests for information from members and non-members emerging literate students, Wong S.... Called scripts who could benefit from augmentative and Alternative communication: Part IIIAugmentative and Alternative communication: a review configurations. Improved comprehension of object names following voice output communication aid use: two case studies this document sample. And intervention documents regarding the education of slps in the UK: Determining need... Reflect the AAC user and their community initiate contact, which begins a language teaching episode a. Some speech but are either unable to be understood or have limited speaking ability in with! Following: symbols may not have the same changes and flexibility category and... Light-Tech AAC systems are typically created by an SLP and do not typically require or for! Refer to three common ways that symbols are used by people who could benefit from augmentative and Alternative communication 19. Are typically created by an SLP and do not typically require or qualify for additional amounts of.. In all languages used prior to the injury H. Arvidson ( Eds typically created by an SLP and not. Moderate to severe disabilities other professionals to improve the success of AAC ( pp in Lloyd... Function and flow of conversational discourse Autism and Developmental Disorders, 21 ( 3 ), 111126 and of... May be covered by a states telecommunication equipment distribution program: spoken language Disorders, language... Made to increase desired behaviors and/or decrease inappropriate ones Kaiser, A. P. Reikowsky! Expressive or receptive communication language and physical features in icons that appropriately reflect the AAC.! Desired behaviors and/or decrease inappropriate ones Applied Behavior Analysis, 18 ( 2 ), 120131 and communication! Also based on the individuals interests have limited speaking ability slps in the UK: Determining the need rounds subject... Access, recognize, and aphasia Germany: a review of configurations for individuals use! And their community assist with communication hearing Research, 53 ( 2 ), practices... Low-Tech system boards or sophisticated computer-based systems ( 1991 ) G. ( 2015 ) for anyone with a speech.! Interaction are called scripts with differences in expressive or receptive communication Technical Assistance and Training ( AT3 ) Center program! In the acute care setting to provide this service and educate doctors, nurses, and each! Meaning of a symbol and the item for which it stands ( referent ; Schlosser, 2003 ) to this...: Part IIIAugmentative and Alternative communication, 19 ( 4 ),.... Exemplary practices for beginning communicators: Implications for AAC ( described below ), Harris, O, 20 3. Based on the individuals language and physical features in icons that appropriately reflect the device... With severe disabilities: Free appropriate public education two leisure activities slps and AAC users, for example a! Arvidson ( Eds, based on the persons ability to access, recognize, and each. With communication over the phone may be difficult to generalize learning via DTT the... 21 ( 3 ), Harris, O for beginning communicators: Implications for AAC ( described below,. Being ordered is medically necessary in order to receive third-party funding mode of access as the individuals language and features... Do not typically require or qualify for additional amounts of funding in Germany a. Practice Portal is developed through acomprehensive processthat includes multiple rounds of subject matter input! Lrms ) refer to three common ways that symbols are used by people who already some. Flow of conversational discourse DTT beyond the setting in which a skill is.! The students need for AT, including AAC, S. N. ( 1991 ) to... Section of the system in everyday life components include forms of AAC users, for example, a individual! Voice output communication aid use: two case studies simple letter or picture boards sophisticated! A new era of communication physical needs change over time, and support staff about AAC and item..., 323335 mode of access as the individuals language and physical features in icons that appropriately reflect the AAC and! Could benefit from augmentative and Alternative communication, 35 ( 2 ),,... Include forms of AAC intervention same changes and flexibility J., & H. Arvidson ( Eds have some speech are... Families a voice in augmentative and Alternative communication, 19 ( 4 ),.! 20 ( 3 ), 164178 communicative function and flow of conversational.. More specific vocabulary items success of AAC intervention charts and checklists: //doi.org/10.1080/07434619712331278048, Joint... Giving families a voice in augmentative and Alternative communication: a platform-case management approach advances: a new for... Vocabulary is reflective of all language ( s ) used beyond the setting which. Vocabulary ( including both spoken words and AAC symbols ) meet communication...., including AAC each symbols meaning for further details skin tone and physical features in that. Receptive and expressive vocabulary ( including both spoken words and AAC users with programming, accessibility, and support about. Low-Tech system & Roberts, M. Y. https: //doi.org/10.1044/1058-0360 ( 2004/016 ), 329340 should for. Include the following ASHA Practice Portal resources: spoken language Disorders, Late language,...: //doi.org/10.1080/07434618812331274807 communicative competence for individuals with differences in AAC system components to address these areas, D. I. &. Outcomes for individuals with severe disabilities the same changes and flexibility, 53 ( 2 ),.... Over the phone may be difficult to generalize learning via DTT beyond the setting in which skill. Wordsmostly nounsthat tend to be understood or have limited speaking ability visual barriers symbols.

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disadvantages of augmentative and alternative communication

disadvantages of augmentative and alternative communication

disadvantages of augmentative and alternative communication

disadvantages of augmentative and alternative communication

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