my questions is about a play called An Inspector Calls.

1. How is the context still relevant in issues related to modern day parallels?
2. What makes the play convincing ?
3. How effective is the play as theatre?
please help Im at a loss.

This has been a UK national curriculum set play and so there is quite a lot on it on the internet.

http://en.wikipedia.org/wiki/An_Inspector_Calls

http://www.bbc.co.uk/schools/gcsebitesize/english_literature/dramainspectorcalls/

Because it is a set text there are a number of revision and study guides available. The main education publishers, Letts Notes, Brodies Notes, York notes all have study information. All of these are available at very low cost.