1.Customer Experience is a sum of all the experiences that the customer has right from search to post sales.
In various categories these different phases have importance as per the category needs.
In case of FMCG the search and presales tend to have higher importance, however in auto sector the post sales service is also equally important.Coming to the measurement Net promoter score gives us the advocacy of the product or service. It is an overall one number representation. This is used by corporates.
The other way is to get all the dimensions from presales to post sales to service mapped and guage satisfaction at each level, this would give us a reading at granular levels.Then overall advocacy and repaurchase could be further calculated.
There are several models most of them rergression based like the TRIM model from TNS, which work on the above principle..
2. If it is to understand the impact of the improved product sales owing to a particular experience one can think of a pre and post experience model.
For example we are introduing few dimensions for better experince and engagement of our customers, we wanted to know the impact of the same and the lift that this would provide. We have conduted a pre exercise mapping the important dimensions of customer experience and engagement. We will conduct a post once we complete the ground level implentations.
3.Here like Rajendra mentioned Descriptive analytics could be useful.
If we can capture the data of the customers at regular intervals then we can build a predictive model as well.
Regards
Sastry