Direct & Plan driven procurement question

SRM 5.0 - Classical scenario.

I am pretty clear about the pre requisites and the process for Direct procurement and Plan driven procurement but I have few questions

1. Can I have direct procurement and Plan driven procurement by using Classic scenario?

2. How do I create shopping cart for Direct materials? - Is it ' Internal goods / services' option from the browser?

OR Direct & Plan driven procurement is the same ?

Can anybody explain to me what is the main difference between the two and how we create the shopping cart?

Thanks in advance and full points will be rewarded.

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J P