“A computerized system that
projects the load from a given
Material Requirements Plan (MRP)
onto the capacity of a system and
identifies underloads and overloads.”
-Russell and Taylor*
Uses of CRP
• If a construction company can start
new projects in the future.
• If production plant can produce a
• If there is enough labor to make up
for increased seasonal sales.
• If the orders that are do Tuesday can
be accomplished with current staff.
• Planned order releases
• Equipment and labor
• Open orders file
Planned order releases
•From the MRP.
•Tells when the order
should be started so that it
is completed on time.
Equipment and Labor
Requirements of equipment
and labor to complete the
Open Orders File
Contains the information
of the orders started that
need to be completed.
Information Provided by
Load profile for each
operation in the production
Makes a comparison of the
work that needs to be
completed and the work in
progress with the systems
CRP is company specific
and requires complex
For large companies
professional help is needed
in designing their CRP
models because of the
complexity and importance
of accurate information.
Calculating a simple
• Inputs into a simple load profile
are capacity and load.
• *Capacity is the productive
capability of the system.
• *Capacity = (number of
machines or workers)*(number
Definitions of Capacity
• Utilization is the percentage of
total time that the worker works
or the machine runs.
• Efficiency refers to how well the
machine or worker performs to a
Definition of Load
• *Load is the standard hours of
work (or equivalent units of
production) assigned to a
Simple Load Profile
• A simple load profile can be used by
calculating the Load Percent.
• *Load Percent =
• Systems with a Load Percent over
100 will not complete assignments
on time without adjustments to the
• Eliminate unnecessary requirements.
• Reroute jobs or labor.
• Splitting the job between two
• Increase normal capacity.
• Increase efficiency.
• Push work back to later periods
• Revise the master schedule
Load Percent Example
A local construction company needs each of its houses
cleaned of all construction debris before they can close
with the buyer. They have one dump truck and a part time
worker who works twenty-five hours a week. Because of
the part time status the worker takes no breaks. For
every four hours of work there is one hour to drive the
debris to the landfill to be unloaded. Five percent of the
time at the site is use to prepare the dump truck for
travel. For the month the construction company has 3
houses closing at the end of the first week, 5 at the end of
the second week, 4 at the end of the third week and 6, at
the end of the forth week. What is the load percent at the
end of each week and can the work be accomplished in
• No. of hours =25
• Shifts = 1
• Utilization = 4/5 = 80%
• Efficiency = 95%
• Capacity = 25*1*0.8*0.95
= 19 hours
Week 1 = 3*4 = 12
Week 2 = 5*4 = 20
Week 3 = 4*4 = 16
Weak 4 = 6*4 = 24
Capacity (Load Percent)
• Load Percent
Week 1 = 12/19 = 63%
Week 2 = 20/19 = 105%
Week 3 = 16/19 = 84%
Weak 4 = 24/19 = 126%
Test Exercise of
A cabinet shop produces and installs cabinets into
new houses. The cabinets need to be installed in
the houses the week they required to be installed to
not slow down construction. A crew of two people
each working 40 hours can install a set of cabinets
in 3 hours. They spend about an hour each person
driving to each installation location. Lunch breaks
are not part of the forty hours worked and the
cabinets are delivered by a separate crew. Due to
experience they are a hundred percent efficient. For
the month 10 installations are needed for week one,
7 for week two, 13 for week three, 14 for week four.
What is the load percent for each week and can the
installations be completed.
• Used to calculate the ability of
the company to meet its orders.
• Best if company specific.
• Load percentage can be used
for simple operations.