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# D1 (Decision 1) 17 May 2013 Official Thread Watch

1. D1 is alright....
2. (Original post by otrivine)
for example question 18)a) on page 82, my route came to

G-A-B-C-D-B-D-E-F-B-G-F-G

is this wrong
No that isn't wrong, when examiners mark D1 papers it's hard because there's so many possibilities, I just done the question and checked your route and it seems fine! It repeats FG and DB, has 13 letters and has a weight of 11.1km. I'd advise you to try some exam paper questions, sometimes the textbook ones can be stupid and the answers aren't very good!

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3. (Original post by Westeros)
No that isn't wrong, when examiners mark D1 papers it's hard because there's so many possibilities, I just done the question and checked your route and it seems fine! It repeats FG and DB, has 13 letters and has a weight of 11.1km. I'd advise you to try some exam paper questions, sometimes the textbook ones can be stupid and the answers aren't very good!

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Thank you so much, that is really kind of you!

Yes I did all the mock and specimen papers, could you help me please, there is a question in the book which is a replica of the specimen paper B, its question 12 part f on page 165
4. (Original post by otrivine)
Thank you so much, that is really kind of you!

Yes I did all the mock and specimen papers, could you help me please, there is a question in the book which is a replica of the specimen paper B, its question 12 part f on page 165
I have no idea, sorry! I haven't done the specimen papers, I've done 2007-13 papers though. Maybe throw it in the big A Level Maths Forum? Is this your first time sitting D1, I've never seen a question like that before, but it'd only be worth 1/2 marks in the exam

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5. This is quite bad- I did a practice paper today and only managed 6/8 questions in the 1 1/2 hour

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6. (Original post by m.dot.mak)
This is quite bad- I did a practice paper today and only managed 6/8 questions in the 1 1/2 hour

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7. (Original post by Westeros)
I have no idea, sorry! I haven't done the specimen papers, I've done 2007-13 papers though. Maybe throw it in the big A Level Maths Forum? Is this your first time sitting D1, I've never seen a question like that before, but it'd only be worth 1/2 marks in the exam

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Hi can u check if my scheduling is correct please
8. (Original post by otrivine)
Lol I can try....

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9. (Original post by m.dot.mak)
Lol I can try....

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thank you!! :

I am really stuck on question 12) part f on page 165
10. (Original post by otrivine)
Hi can u check if my scheduling is correct please
Scheduling for what? You mean like a gantt chart, when you schedule events from the critical path algorithm?
11. (Original post by Westeros)
Scheduling for what? You mean like a gantt chart, when you schedule events from the critical path algorithm?
12. (Original post by otrivine)
Always start by scheduling the critical events at the top of the chart, next to each other. I then work in alphabetical order, it makes the most sense to me. Also, by working in alphabetical order, you usually start with the activities that are closest to the start. But if you have a different way of doing it then continue doing so!
13. How can you find a Traversable route?

I get a bit stuck trying to find an actual route quickly after I've added the arcs to my diagram - is there a video or faster way to do this?
14. (Original post by Better)
How can you find a Traversable route?

I get a bit stuck trying to find an actual route quickly after I've added the arcs to my diagram - is there a video or faster way to do this?
I don't think there's a quick efficient way to do it, it's just trial and error. I normally try to go around all the outside arcs, then focus on the inside!

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15. (Original post by Westeros)
I don't think there's a quick efficient way to do it, it's just trial and error. I normally try to go around all the outside arcs, then focus on the inside!

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Oh really? I will try that.

Thanks for the response. If anyone else has any of there methods please do share
16. (Original post by Better)
Oh really? I will try that.

Thanks for the response. If anyone else has any of there methods please do share
I use the method of the above poster and it seems pretty good so far lol

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17. (Original post by tiny hobbit)
All of them from 2001 onwards - perhaps I should mention that I am a teacher and have been teaching it since then.

I find that reading comments on TSR helps me to understand the misconceptions that my own students have.

If you do any papers before 2009, remember that some topics moved from D1 to D2. Don't do any questions on flows in networks, Simplex or planarity.
Thanks Tiny Hobit for telling me to get my Teacher to mark D1 Papers,

It is completely different to C3/C4. I just did a Paper and I thought I got an A*, I lost around 10 marks; I would have never known if I had marked it myself. Just got about got an A though!!

DOES ANYONE KNOW HOW/WHY You have to Number the Events in Critical Path Analysis Activity Networks. Thanks to the help here/videos I can draw them out pretty quickly now, but I am not so sure about this numbering business.
18. When you can start and finish at any point (route inspection) Which points would you choose to get the shortest distance?
19. (Original post by Nitrogen)
When you can start and finish at any point (route inspection) Which points would you choose to get the shortest distance?
It really doesn't matter if it's eulerian... the only exception is if they state in the question, for example: your office is at node 'x'
20. (Original post by posthumus)
It really doesn't matter if it's eulerian... the only exception is if they state in the question, for example: your office is at node 'x'
Yes its those question! Can you tell me how to tackle them please

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