1. ease of use2. the user is interacting with the plasma sample program is always clear.3. a program of familiar terminology and can. The devil follow easily.
1. Ease of use 2. The user interacts with the application are not always clear on the order of 3 to the program. The terminology that is familiar and can Mara has to follow
1. Ease of use.2. Interacting with users regular opponents always clear.3., order of the program, vocabulary is familiar and SA, the devil follow easily.