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# Edexcel D1 Critical Activities watch

1. Hi,

My textbook defines critical activities and critical paths but I am a bit confused as to how you calculate them as it sounds a bit like trial and error is involved if you just try tracing every possible path. Is there meant to be a clear method as I know it has come up in a past paper?

Many thanks in advance
2. (Original post by bendent1234)
Hi,

My textbook defines critical activities and critical paths but I am a bit confused as to how you calculate them as it sounds a bit like trial and error is involved if you just try tracing every possible path. Is there meant to be a clear method as I know it has come up in a past paper?

Many thanks in advance
I should have thought that it comes up in EVERY past paper. It's definitely not trial and error.

You first need to fill in the early and late times at the nodes. Have a look in the book about filling in these times.

A critical activity is one where the early and late times are equal at the beginning of the activity and at the end of the activity and also the difference between the times at the beginning and end of the activity equals the duration of the activity.

And ask your teacher for help. Much of D1 is a lot easier to explain in person.
3. (Original post by tiny hobbit)
I should have thought that it comes up in EVERY past paper. It's definitely not trial and error.

And ask your teacher for help. Much of D1 is a lot easier to explain in person.
D1 is very easy if you understand the concepts. I would totally recommend following tiny hobbit's advice here and going to talk to your teacher because if you fully understand all the topics, D1 is an easy 90-100 ums

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