What is a PhD?, and what’s the difference between a PhD and a MSc degree?, what it takes to complete a PhD programme?.
You will find very useful information on the web. The following web sites can guide you and/or help you to make up your mind as they tell the pros and cons for pursuing a PhD degree. Hopefully, they can help prospective students to make a sound decision about their future graduate studies.
The illustrated guide to a Ph.D.
What is the Difference Between a Master’s Degree and a Doctoral Degree?
PhD study: what is a PhD? (this site is particularly useful. Navigate
the right hand side «PhD study» menu for much more info: PhDs
Explained, Making Choices, Doing a PhD, etc)
Is a PhD the right option for you?
Not for love or for money – why do a PhD?
What is getting a Ph.D. really like? The purgatory of grad school