Expert witness for IP issue

The first three general things to know about expert witnesses are:
1. They are a witness for the court/tribunal. That's a notional, but important, consideration. Although engaged by one party, their evidence is there to assist the court/tribunal with technical expertise.
2. Experts are given a brief of information and asked to respond to specific questions/issues.
3. They are only experts in the areas they can establish themselves as experts. That means they need to constrain their evidence to the areas in which they can demonstrate they have the requisite knowledge, qualification and expertise.

How the IP was obtained by one party or the other? That's not something an expert should be commenting on, unless that it their particular area of expertise.

If the question doesn't go past general or legal knowledge requirements, it will be a question of fact for the court or tribunal.

Experts in ip cases generally give opinion evidence about the validity of ip And whether its been infringed. The basis for infringement opinion usually comes come other witnesses of fact who put evidence on like seminar presentations seen by the witness.