Portman Estate area remained largely residential, attracting the prosperous middle class who wanted to live near the centre of London. There were also mews for tradesmen and servants. At the southwest corner of the Estate, where Marble Arch now stands, was the Tyburn gallows, London’s principal place of public execution until 1783. Development of the area north of the Marylebone Road around Dorset Square continued after 1815, and to the North West in Lisson Green, workers’ cottages were built from 1820 to 1840. Many of the original Georgian houses north of Portman Square were redeveloped as mansion blocks, which were let on
Gulf of execution what it means. Both phrases are mentioned in Donald Norman's 1986 book "User Centered System Design: New Perspectives on Human-computer Interaction." This can be illustrated through the discussion of a VCR problem. Let us imagine that a user would like to record a television show. They see the solution to this problem as simply pressing the "Record" button. However, in reality, to record a show on a VCR, several actions must be taken: The difference between the user's perceived execution actions and the required actions is the gulf of execution. Gulf of execution In human computer interaction, the gulf of