IMO there are three main fields for each company which need to be evaluated to what extend digitalisation will come up, change what is there and how much investment should be done in digitalisation.
1. improve processes, make them more efficient.
Approach to find those is probably:
a. define meta processes with the company (ordering, production,handling returns, etc.)
b. sit with the employee to see how they work including time spend or wasted
c. define areas for improvement and sell to the company
2. new changes to the company (structure and changes in meta processes) which goes beyond optimization
3. New changes to the market (how you handle customers, how your products will change and so on) Imagine here car manufacturers which go to car sharing having in mind automated driving and that people won't need individual cars in 20 to 30 years.
the approach for 2 and 3 is more
a. define factors which influence the company inside and outside (mobile usage, online purchasing and so on)
b. define trends evolving out of those factors and what the likelihood for those is to develop into any direction
c. create scenarios how market will look like in further future and evaluate the likelihood
d. define which scenarios to focus on and which step towards them is to be taken
this is just when thinking about it but there might be other and much better ways.