Since the ubiquitous computation is born and different mobile devices begin to be able to execute applications, it is necessary deciding on if it is optimal the load and execution of the application on the mobile device or on the contrary, if it would be better the implementation of an application server that the different mobile devices realize to the requests and transactions by web. Certainly, there are increasingly companies that use mobile devices integrated in their applications. Because

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... f it, it is necessary the development of this type of applications. The above mentioned decision is of vital importance for the functioning, maintenance and cost of the application. This document tries to present the advantages and disadvantages of each one of both options and an example about how both would be implemented for the management of records of a quality system.