## 5 Conclusions
#### Limitations and Future Improvements  
The tests and analysis performed in this study offer a privileged window into the everyday life of the people who need accessible communications. By this means and with due respect to privacy, we were allowed to observe their main concerns, how they adapt the application to their needs, and what their communication patterns are. From the test \begin{table}
\begin{tabular}{l c c c c c} \hline \hline
**Category** & **Happiness** & **Anger** & **Sadness** & **Fear** & **Neutral** \\ \hline Social interaction & 18.92\% & 0.00\% & 0.00\% & 0.00\% & 81.08\% \\ Nutrition & 37.46\% & 0.00\% & 0.00\% & 0.00\% & 62.54\% \\ Leisure & 27.68\% & 0.00\% & 0.00\% & 0.00\% & 72.32\% \\ Care & 10.00\% & 0.00\% & 0.00\% & 0.00\% & 90.00\% \\ Emotions & 34.43\% & 18.03\% & 14.75\% & 4.92\% & 27.87\% \\ Health & 0.00\% & 12.90\% & 0.00\% & 0.00\% & 87.10\% \\ \hline \hline \end{tabular}
\end{table} 
Table 19: Sentiment analysis of new pictograms. observations, we identified a series of limitations present in PicoDroid Lite (and many other communicators) and investigated how those limitations could be solved for any aac application. * **Specific profiles:** Observing the newly created pictograms and usage patterns, we conclude that the application could be offered alongside a set of predefined profiles adapted to specific contexts, such as school, health care, or playgrounds. This would reduce the time needed to navigate the pictogram grid and would make personalization faster and smarter. * **Pictogram suggestion:** When creating a new pictogram on a predefined profile or when doing so in a given category, the application could suggest related concepts in order to make the creation process more dynamic. * **Time-based sorting. ** Test 2 (see Section 4.1.2) highlighted that users have different needs at different times of the day. The application could adapt to these changes by rearranging the grid, giving priority to those categories that are more likely to be needed at a particular time of the day. Test 3 (see Section 4.1.4) indicates that this could be useful for weekday adaption. * **Repeat last action:** Test 4 (see Section 4.2.1) showed that users tend to repeat the same sentence one or many times. This process could be helped by introducing a button that allows one to repeat the last sentence without needing to navigate the grid again. This would be notably useful in urgent contexts. Observing the applications cited in Table 1, almost all of them lack some or every point cited above. Apps like Card Talk, SymboTalk, and Twinkl Symbols include mechanics for category distinction, like communication boards. However, these boards do not constitute an entity similar to having a domain-specific profile, as our clues suggest. On the edition and creation of new symbols, no application includes suggestions based on related concepts. The applications that include an online search of pictograms (arasaac being the most frequent source) only recommend other pictograms that also include the search query. Regarding user experience, no application has previously considered time (time of the day, day of the week, etc.) as a relevant factor for adaption. Additionally, those applications that seek to provide fluent support for communication could consider introducing a shortcut for last-phrase reiteration. We detected a set of strengths already implemented in PicoDroid Lite that would be positive for other existing applications. The method of pictogram indexation provides a straightforward method for sentence construction, SymboTalk being the only studied application that includes a similar technique. Moreover, developers should consider including access to an online source of predefined pictograms such as araasaac, as 55.87% of users find it useful. The performed analysis led to relevant clues about the development of aac mobile applications, highlighting the strengths of some methodologies implemented in PicoDroid Lite and noting some gaps that many applications present.