A software company has been awarded a project to write an app to be installed on the operating system of a mobile phone. To ensure a wide customer base, the following requirement has been raised for…

A software company has been awarded a project to write an app to be installed on the operating system of a mobile phone. To ensure a wide customer base, the following requirement has been raised for the app: 'It must be possible to tailor the app so that it runs on the operating system of other mobile phones. This tailoring must take less than 5 days' developer effort.' How will this requirement be categorised in the requirements catalogue?