What can be the bases for - Product/Services, Personnel and Image Differentiation

What can be the bases for
a.) Product differentiation/ Services Differentiation
b.) Personnel Differentiation
c.) Image differentiation

a.) Product differentiation/ Services Differentiation

-Modify the objective properties of the products or services.
-Linking the sales and service function.
-Be the first to introduce a new product
-Physical location of a firm
-Mix of products or services sold
-Competitors linkage
-Maintain and improve its reputation
-Customization
-Sophistication of the product
-Marketing tools used
-After sales services offered

b.) Personnel Differentiation

-Should have good skills and knowledge
-Should be courteous
-Should always be consistent and accurate
-Should be trustworthy for the end consumer
-Should be quick in responses
-Should make effort to understand and communicate

c.) Image differentiation

-The identity should be well differentiated from the image
-Precise aim to identify itself to its customers.
-Perception of the firm in the minds of the consumer