[Halld-cal] Draft level 5 CR for Bcal and Fcal activities

[Christina Kourkoumeli]

Dear Elton,
Thank you for this detailed explanation.Yes,now I understand and agree 
with the schedule.
                            Cheers,
                           Christine
Elton Smith wrote:
> HI Christina,
>
> Sorry for the confusion. The units of the schedule are weeks, and it is
> assumed that 44 working weeks is a year (takes account of holidays, sick
> leave, etc).
>
> Float is the amount of time that an activity has before any further delays
> start impacting the overall schedule. For example, if there is an activity
> that takes 2 weeks and it must completed before other activities that
> start in 5 weeks, then the first activity has 3 weeks of "float". It also
> means that if that activity is delayed by 3 weeks it will not impact the
> start of the successor, but if it is delayed by 4 weeks, the successor
> will be pushed back by 1 week.
>
> For the Fcal monitoring system, specifically, it currently has 83 weeks of
> float (i.e. it is currently scheduled 1.9 years before it begins to impact
> successor activities). The proposal is to delay its start by 48 weeks (a
> little over one year) till FY 2011 (fall of 2010). With this change, the
> activity wil still have 35 weeks of float left, which is some insurance
> that even if it takes a little longer to complete than projected, we can
> still be confident that it will be completed in time.
>
> Let me know if you still have questions about how we propose to change the
> schedule.
>
> Thanks, Elton.
>
>
>
> Elton Smith
> Jefferson Lab MS 12H5
> 12000 Jefferson Ave
> Suite # 16
> Newport News, VA 23606
> elton at jlab.org
> (757) 269-7625
> (757) 269-6331 fax
>
> On Tue, 6 Oct 2009, Christina Kourkoumeli wrote:
>
>   
>> Dear Elton and Matt,
>> sorry for not answering before but I  simply do not understand enough to
>> give a resonable answer.What "float" does it mean?Does "delay+24" mean
>> that it will take 24 moths for completion?Anyway if it looks reasonable to
>> others,I agree too.
>>                               Cheers,
>>                               Chrisine
>>     
>>> Hi Matt and Christina,
>>>
>>> Below are the proposed schedule changes to the Fcal and Bcal activities to
>>> implemented in a change request this month. Please comment.
>>>
>>> -------------------------------------------------------------------------
>>> We would like to adjust the schedule for some activities (no change in
>>> cost), which are indicated below. I briefly spoke to Pat and he quickly
>>> checked that there would be no obvious impact on successor activities with
>>> the proposed changes. This of course should be verified with a "what if"
>>> schedule. We would like to implement the CR this month to avoid starting
>>> the Fcal monitoring activity (15222080), which is currently scheduled to
>>> start in October 2009.
>>>
>>> Activity    Name              Float    Change
>>> 15221155    Winston Cones     39       delay +24
>>> 15221170    Signal Cables     47       delay +24
>>> 15221171    HV SiPM Cables    49       delay +24
>>> 15221172    HV PMT Cables     49       delay +24
>>> 15221173    Light Guides      80       delay +24
>>>
>>> Justification: Will require time to finalize adjustments to Bcal readout
>>> once final decision is made.
>>>
>>> Activity    Name              Float    Change
>>> 15222080    Fcal Monitoring   83       delay +48
>>>
>>> Justification: Will require feedback from Fcal module fabrication contract
>>> to define interfaces for monitoring of the lead glass.
>>> ---------------------------------------------------------------------------
>>>
>>> Elton Smith
>>> Jefferson Lab MS 12H5
>>> 12000 Jefferson Ave
>>> Suite # 16
>>> Newport News, VA 23606
>>> elton at jlab.org
>>> (757) 269-7625
>>> (757) 269-6331 fax
>>>
>>>
>>>       
>>
>>     
>
>