Looking at charts is useful, but it doesn't really give you the...

Looking at charts is useful, but it doesn't really give you the information you need to invest in a company. It almost becomes a gamble if you look at graphs alone.

Do some research on the company, look at the strategies that the company is pursuing (internal analysis), look at their financial statements (although this is looking at past information too), apply some economic analysis on them (external analysis), and then come to a conclusion whether the company is valuable, over-valued, under-valued, etc.

But I think Woolworths is a buy now and you can see my reasoning in another thread I've posted recently.