Answer:
By finding a factor that all have in common: that they are currently in the company and know how it works.
Explanation:
The manual that employees will have aboutthe new accounting system has to be the easiest to ready as possible. As the text mentions, in the company I have experienced accountants and others that are not and employees from different degree levels. Some might understand certain infromation and some might not.
However, what they all have in common is that they are all working in the company and know the current accounting system, because is something that concerns them, even though they have years working them, are new or are not going to last longer.
The best I can do is take advantage of that fact and show them the differences between the old accounting system with the new ones, by that way they will be able to land the information and understand it correctly.