Page 289 - ExtendSim User Guide
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Resources and Shifts 263
Resource requirements
b)Identify the criteria that are common to each resource collection
c)Determine the quantity required from each collection
d)Determine if alternative collections could be considered if the quantity cannot be obtained from a particular collection
e)Identify the criteria for any of those alternative collections
f)Determine the quantity required from any of the alternative collections
2) Usetheresultsoftheprocessabovetodeterminehowmanyquantityexpressionsare needed. A quantity expression will be required for each distinct resource collection from which a quantity will be selected.
3) Oncethequantityexpressionshavebeenidentified,determinehowmanydifferentcriteria are needed to represent all of the distinct resource collections referred to in step 1. Each cri- terion is expressed as a condition on the values of a resource or group property and is referred to as a filtering condition. Filtering conditions are used in quantity expressions to generate the collection of resources from which the specified quantity is selected.
How to create a new resource requirement
As was shown starting on page 252 the steps in manually creating a resource requirement are: Create the filtering conditions needed by the quantity expressions
Create the quantity expressions needed by the resource requirement
Create a resource requirement using the quantity expressions
Filtering conditions
Filtering conditions are the smallest component of a resource requirement and creating one or more filtering conditions is the first step in defining a resource requirement. A filtering condi- tion is a specified aspect of a resource or group property. For example, a filtering condition could be that the resource comes from a particular pool or that a group member has a skill level higher than a certain number.
Saved filtering conditions are used in quantity expressions, discussed later. When a quantity expression with a filtering condition gets executed, the population of resources is narrowed to a list of resources that meet the specific condition that was filtered for.
The Create/modify filtering conditions frame (Resource Manager’s Requirements tab) is where filtering conditions are created and edited.
Types of filtering conditions
Creating a new filtering condition
Filtering conditions filter on properties. There are two types of filtering conditions, depending on whether the properties belong to resources or group members:
1) Aresourcefilteringconditionfiltersononespecified
resource property, as shown in the screenshot to the
right. A resource property is one of the dynamic or
static properties in the Resources table. Examples of resource properties are: pool, total idle time, or a group. (See “Resource properties” on page 258.)
Discrete Event

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