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# Edexcel D1 - 17th June, 2016 [Exam discussion] watch

1. The official mark scheme for this D1 is harsh. More than 3 workers on the scheduling
= 0 marks currently.
2. is there an unofficial mark scheme anywhere?
3. Here is my mark scheme. Only got hold of the paper today. It was indeed a long paper (even longer when you have to draw your own diagrams!)

https://1drv.ms/b/s!ALt0vQqZgjKy42U

Mr Ward
4. (Original post by forthetillerman)
is there an unofficial mark scheme anywhere?
Here is my mark scheme. Only got hold of the paper today. It was indeed a long paper (even longer when you have to draw your own diagrams!)

https://1drv.ms/b/s!ALt0vQqZgjKy42U

Mr Ward
5. (Original post by ward309)
Here is my mark scheme. Only got hold of the paper today. It was indeed a long paper (even longer when you have to draw your own diagrams!)

https://1drv.ms/b/s!ALt0vQqZgjKy42U

Mr Ward
Awesome cheers - anywhere from around 59-64 marks. I'm confident this is an A

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6. (Original post by ward309)
Here is my mark scheme. Only got hold of the paper today. It was indeed a long paper (even longer when you have to draw your own diagrams!)

https://1drv.ms/b/s!ALt0vQqZgjKy42U

Mr Ward
You've left D out of your scheduling.

It's a lot tighter then.
7. For the algorithm question. Where they ask which value should be X. You wrote it was due to it being an integer. If I were to write as the x value would never equal zero sending the algorithm into an infinite loop, would that give me marks?
8. For the min bound for the gaant chart I still got 5 but I put the wrong time (6.5) and activities, would I lose both marks?
9. (Original post by Raaaas)
For the min bound for the gaant chart I still got 5 but I put the wrong time (6.5) and activities, would I lose both marks?
I think I did the same as you. I think there may be more than one time because I remember seeing two options but chose the earlier one so I think we're still both right.
10. (Original post by 4nonymous)
I think I did the same as you. I think there may be more than one time because I remember seeing two options but chose the earlier one so I think we're still both right.
Yeah, but looking at his chart there only seems to be one answer?
11. (Original post by Raaaas)
Yeah, but looking at his chart there only seems to be one answer?
Yh it was. hmm not sure now?
12. (Original post by 4nonymous)
Yh it was. hmm not sure now?
Lets pray this markscheme is wrong lol, but if it is right, do you think we'd drop one or two marks?
13. Apart from the scheduling that markscheme is all correct

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14. (Original post by Raaaas)
Yeah, but looking at his chart there only seems to be one answer?
day 6.5 is also 5 workers. Multiple justifications possible here
15. (Original post by tiny hobbit)
You've left D out of your scheduling.

It's a lot tighter then.
Yes, you're correct I did miss D. Therefore 4 workers must be used. I have attached a possibility.
Attached Images

16. (Original post by ward309)
Yes, you're correct I did miss D. Therefore 4 workers must be used. I have attached a possibility.
I've managed it in 3, but do tell me if I've made a mistake:

AEGIN (36)
BDJM (34)
CF (1 gap) H (1 gap) KL ((36)
17. (Original post by tiny hobbit)
I've managed it in 3, but do tell me if I've made a mistake:

AEGIN (36)
BDJM (34)
CF (1 gap) H (1 gap) KL ((36)
I would need to draw it but seems good
18. (Original post by ward309)
I would need to draw it but seems good
What do you think grade boundaries will look like
55/56 for an a?
19. (Original post by tiny hobbit)
You've left D out of your scheduling.

It's a lot tighter then.
Wait I am confused. I used 4 workers in my last part but a lot of people say it can be done using 3. ???

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20. (Original post by cogito.)
Wait I am confused. I used 4 workers in my last part but a lot of people say it can be done using 3. ???

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I've done it with 3 (see above post) and I don't think I've made any mistakes. I used "latest start times" to choose which activity to start next.

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