Also, Software Development Kit. In mobile a separate sub-application within the application environment which is directed at performance of certain common functions such as measurement or counting of advertising activity and/or the delivery or storage of advertising content. These SDK Based functions can be developed by a third party to the application developer and fit into the application, thereby allowing a common measurement SDK to be used across applications. In these cases certain controls, such as software development controls and software and data integrity controls may rest with the SDK developer. Integration of the SDK into the application and selection of measurement parameters or options to be used by the SDK are generally the responsibility of the Application developer or seller.