Maslow Needs Outdated
I find the Maslow hierarchy of needs outdated. Plus it has never been empirically validated. I find Marshall Rosenberg's approach
(see introduction into non-violent communication by him) to human needs and addressing them much more effective.
For addressing needs in sales I typically refer to Interpersonal CircumPlex (ICP) models
such as disc
which provide the users with a wide array of tools for recognizing and addressing needs / motives / buying-signals, and so on.