...
A Text Field, where the user can enter their search.
A magnifier icon, placed within the text field, to the right.
In Search with Auto-Suggest, the user may click the magnifier Icon Button to initiate the search.
In Live Search the magnifier icon helps to identify the input field as a search bar.
A hint text, placed within the text field, left-aligned.
A Clear All icon button (xX). Appears to the left of the magnifier icon once a character has been entered in the text field.
...
The users' knowledge and expected behaviourbehavior. Do they know the full name of the item? How familiar are they with the list terminology and the structure of each item?
The list content and design. Does it include complex items, such as agents names? Does it have a complex design, for example a combination of numbers and strings?
...