The system must be able to perform its functions with high performance So the application must be connected to the server using websockets protocol so it could only behave if there is new data received by the server rather than long pooling or making so many http requests regardless if there is new data came or not to improve the performance ii Availability The android device must be able to perform the Request transactions even if there is no connection or opened socket with the server The android system must save the transactions in the mobile for later synchronization with the server iii Security The system must have a security mechanism for the data stored in it e g passwords The system must secure the communication layer between the server the web browsers and the android devices iv Usability The system design must consider the quality components of usability The first component is learnability which means how easy is it for users to perform basic tasks the first time they face the design The second is the efficiency refers to how quickly can they perform tasks The third is the memorability which is refer to how easily can they re establish proficiency The fourth component is the errors which is refer to how many errors do users make how severe are these errors and how easily can they recover from the errors The last one is the satisfaction which is refers to how pleasant is it to use the design Nielsen 2003 3 3 8 Logical Database Requirements The database server must be able to handle the Customer Request data that comes daily from the android devices The system requires speed at the insertion processes performed by the database engine
