Contents 18.1 Introduction ...........................................................................................492 18.2 Mobile Phone-Centric Architecture .......................................................495 18.3 Scenarios .................................................................................................498 18.3.1 Smart Pillbox Scenario ..............................................................498 18.3.1.1 Typical Scenario .........................................................498 18.3.2 Sleep Quality Logger Scenario ..................................................498 18.3.2.1 Typical Scenario .........................................................499 18.3.3 Assistive Listening Device Scenario ...........................................499 18.3.3.1 Typical Scenario .........................................................499 18.4 User Evaluation ..................................................................................... 500 18.4.1 Web Survey .............................................................................. 500 18.4.2 User Tests in Laboratory ............................................................501 18.4.2.1 Test Characteristics ....................................................502 18.4.2.2 Sample ........................................................................502 18.4.2.3 Processing of the Data ................................................503