They provide a structure that is similar in some way to aspects

of a familiar entity, but also have their own behaviors and properties. More

specifically, it is one that is instantiated in some way as part of the user

interface.

Allowing the design team to establish a set of common terms that

all can understand and agree upon, reducing the chance of misunderstandings and

confusion arising later on.

..................... are effective visual ways of grouping information

involves modifying existing representations through making marks (crossing off, ticking) → annotation

externalizing to reduce memory load, computational offloading, annotation and cognitive tracing → external cognitive frameworks

Which one is recommended for user interface Recal or recognittion?  give an example to support your opinion.

Inamo Restaurant is a very good example of an interactive system, analyze the system in means of PACT.

Describe who are the People, Activities, Context and Technology

uses users knowledge of how they manipulate objects in the real

world, ex moving, selecting, opening and closing