The information provided by a user when creating an account is the basis of the profile. You add to that profile by explicitly querying the user and by observing his behavior on the portal. Table 7.3 lists some of the elements you might want to add to a profile.
|Data Elements||Means of Gathering||Comments|
|Username||Explicit during registration||Often email address is used|
|Email address||Explicit during registration|
|Secret question||Explicit during registration|
|Name||Explicit during purchase|
|Address||Explicit during purchase|
|Phone number||Explicit during purchase||Do no solicit from user unless needed for purchase as phone number not readily provided until relationship with portal is trusted|