What tasks would it be used for? 

The Samsung PDA would be used for organizing your work for almost every lesson, talking about homework, essays, deadlines, anything that has to be done on time. It is also useful for sending emails using the school emails, and connecting to the Internet for school websites etc. Therefore, I know that the PDA is useful for every class and every grade in the school. 

Would all students need one ? 

I think that it would be better if all the students have one, from grade 6 to 12. They can learn the process of organizing their work and keeping responsibilities to keep the PDA's safe. If we cannot afford to get it for all the grades, then it can start from grade 10 and move up to grade 12. This can help the IB students make their studies easier and less complicating. It can organize their work in a way where it cannot be gone or lost. 

How could the use of technology add value or improve the lesson ?