you are to prepare a network diagram using the Activity on the Arrow technique. You must use as many concurrent activities as you can and you must show the critical path. (A network diagram with no concurrent activities will result in no grade points being earned.)
You will be given a crew of some number of employees, each with a specific skill, but all will be capable of working with hired craftspeople and the other employees. You as well as your employees are considered to be generally capable of doing most anything. The employee must be used on activities requiring the stated skill the employee has. At least 50% of the electrical worktime must be done by the hired electrician. All of the brick work must be done by the hired mason.
Worktime is the total hours needed to do the activity. Duration of the activity is therefore based on the crew size, hired craft if appropriate, and overtime if any. Overtime is limited to 2 hours per day per crew member excluding hired craftspeople which will not work overtime. No work will be done on Saturday or Sunday. You will be given a start date and you will have to determine the finish date.
The only costs you need to calculate are the employee costs. Each employee will have a unique pay rate. you will note on the network diagram the cost generated by each employee on each activity to which you assign that employee. When more than one employee is assigned to an activity you will also show the total cost. You want to keep your employees gainfully employed, however you may not need all of them at the very end of the project.
You as the contractor/project manager will do all of the ordering, hiring and renting. Each of these activities will require 1 hour of your time. You can spend the rest of your time on whichever activity you select. There is no cost allocated to your time, i.e. you only get paid if the project makes money.
ASSUMPTIONS
Contractor is appropriately licensed. Contractor has all necessary tools. Contractor's employees are of age with appropriate work documents. Contractor is bonded. Building site is in Hamilton County, Tennessee. The site is flat and the structure will be located beyond set back line. Hired craftspeople are appropriately licensed.
ACTIVITIES
LEADTIME ITEM(S)
2 weeks Order 2 garage doors
1 week Order 1 personnel door with frame
2 weeks Order roof trusses
1 day Order 3 fluorescent fixtures with tubes
2 weeks Order 2 electric garage door openers with remotes and inside switches
4 weeks Order 1 window with fram
1 day Order crushed rock
1 day Order Romex cable 2 wire with ground
1 week Order concrete for slab with fiber reinforcing for concrete salb
1 day Order slab vapor barrier plastic sheet and staples
1 day Order 2 single pole switches with double box and cover
1 day Order 6 boxes for lights
1 week Order 100 amp panel with main breaker, 2 - 20 amp breakers, 2 - 15 amp breakers,
8 standard receptacles, and 1 ground fault interrupter receptacle with covers
3 days Order bricks, mortar, sand, and wall ties
1 week Order shingles, roof ridge vents, and nails
2 days Order Hardie plank and nails
2 days Order freeze proof exterior faucet, 3" plastic drain pipe with brass floor drain inlet and cover
1 day Order roofing paper
1 day Order 2 exterior flood lamp fixtures with bulbs and 1 exterior fixture with bulb
1 week Order 1 lockset and 1 deadbolt with keys
1 week Order roll insulation
1 week Order soffit and fascia material
2 days Order rebar, anchor bolts with nuts, and tie wire
3 days Order sheet rock, tape, mud, and screws
1 week Order framing material, including pressure treated floor plates and nails
2 days Order paint for interior, exterior, and trim for two coats
1 day Order siding vapor barier
2 days Order roof sheathing and nails
1 week Rent small excavator delivered and picked up for digging footing and utility ditches.
1 week Rent truck crane with operator for setting trusses
1 week Rent wall behind tamper for compacting crushed rock (transported to and from job site by rental agency)
2 weeks Hire brick mason
1 week Hire roofer
2 weeks Hire electrician
3 days Hire gutter and down spout installers
3 weeks Hire sheet rocker
4 days Hire termite treatment
1 week Hire garage doors hung
WORKTIME ITEM(S)
6 hours Install interior receptacle boxes and switch box
10 hours Install soffit and fascia
5 hours Install rebar
3 hours Locate corners and establish top of footing which is top of slab
9 hours Pour concrete slab, plus cure time of 24 hours
2 hours Submit final bill
7 hours Install sewer pipe from street connections to center of slab
3 hours Pour concrete footing, plus cure time of 36 hours
2 hours Install exterior lights
14 hours Paint Hardie plank and exterior trim
7 hours Form footing including brick ledge
15 hours Install electrical panel and all wirng
2 hours Place crushed rock for slab
6 hours Excavate for footing, water line, and sewer line
3 hours Compact crushed rock for slab
36 hours Request final inspection
1 hour Install freeze proof exterior faucet
30 hours Frame walls
1 hour Treat foundation after excavation for termites
2 hours Submit progress invoice after framing completed
5 hours Install water line from street connection through footing
1 hour Cover crushed rock with plastic vapor barrier
48 hours Get customer's agreement and signature on construction contract
60 hours Request Electric Power Board service installations
16 hours Install wall sheathing
20 hours Set trusses
2 hours Submit progress invoice after slab completed
36 hours Install brick veneer
24 hours Get building permit
4 hours Install wall vapor barrier
5 hours Provide documents on warranty for roofing, garage doors, garage door openers, termite treatment, and contactor's general warranty.
5 hours Install gutters and down spouts
7 hours Install roll insulation in walls and ceiling
11 hours Install Hardie plank siding to gable ends
2 weeks Install roofing
3 weeks Install sheet rock
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Once YOU have come up with attempted answers to YOUR questions, please re-post and let us know what you think. Then someone here will be happy to comment on your thinking.
To create a network diagram using the Activity on the Arrow technique, follow these steps:
1. Identify all the activities involved in the project based on the given information. Each activity should have a clear start and end point.
2. Determine the sequence of activities by identifying any dependencies or relationships between them. For example, some activities may need to be completed before others can begin.
3. Assign worktime and duration to each activity based on the crew size, hired craftspeople, and overtime restrictions given in the prompt. Calculate the total hours required for each activity.
4. Determine the leadtime for each item by considering the order and delivery times provided in the prompt. These leadtimes will affect the start dates of the corresponding activities.
5. Set the start and end dates for each activity, taking into account the leadtime and the dependencies between activities. You can use a calendar to track the working days and exclude weekends.
6. Draw the network diagram by representing each activity as a node (circle) and connecting them with arrows to show the sequence and dependencies. Include the worktime and duration on each arrow.
7. Identify any concurrent activities where multiple activities can be performed simultaneously. Try to maximize the use of concurrent activities to shorten the project duration. These concurrent activities should have different nodes but can have the same start or end dates.
8. Determine the critical path by identifying the longest sequence of activities that determines the total duration of the project. Any delay in the critical path activities will cause a delay in the overall project completion.
9. Calculate the cost generated by each employee on each activity based on their pay rates. If multiple employees are assigned to an activity, calculate the total cost.
10. Note the cost and total cost on each activity in the network diagram, relevant to the assigned employee(s).
11. Review the network diagram to ensure all the given requirements are met, such as at least 50% of the electrical worktime being done by the hired electrician and all brick work being done by the hired mason.
12. Make adjustments to the schedule and resource assignments as needed to optimize the project duration and minimize costs.
13. Calculate the project's start and finish dates based on the critical path and ensure the project is completed within the given start date.
14. Present the final network diagram showing the activities, dependencies, durations, start and end dates, concurrent activities, critical path, and costs associated with each activity.
Note: The specific solution, including the network diagram and calculations, will depend on the assigned crew size, employee skills, leadtimes, and other factors provided in the prompt.