Websphere Business Modeler 6.1 Certification: Apply comparative analysis to evaluate the impact of a change to a model

IBM Certification Test 992.4 - Analysis and Validation

How to Apply comparative analysis to evaluate the impact of a change to a model
1. Conducting comparative analysis
2. Related links

How to Apply comparative analysis to evaluate the impact of a change to a model

Conducting comparative analysis

Perform one of the several comparative analyses to find differences and similarities between the results of two different simulation runs.

Before performing this analysis you must have two simulation results that you want to compare. For the following comparisons, which are intended to highlight differences in how a process performs when simulation settings are changes, both results must come from the same simulation snapshot:

Processes Resources Time Comparison
Processes Resources Cost Comparison
Processes Classifier Duration Comparison
Processes Classifier Cost Comparison

The other comparisons can be carried out against any two results in the same project.

Use processes comparison analysis to highlight differences in simulation results between versions of a modeled process, simulations of different sizes, or among simulations with different decision probabilities. For example, you can use processes comparison analysis to compare the average length of time it takes to complete your as-isprocess versus your proposed to-be processes. When you make changes to a process to optimize cost or throughput performance, you may want to perform several types of comparison analysis to confirm that your intended optimizations are realized, and that there are no unwanted side effects.

The average values presented by the comparison analysis are identical to those presented by the process cases analyses.

To do a comparison analysis, complete the following steps:

In the Project Tree view, right-click the first simulation result that you want to analyze, and then select Dynamic Analysis > Processes Comparison Analysis and then one of the following choices:
- Processes Duration Comparison
- Processes Activities Total Time Comparison
- Processes Cost Comparison
- Processes NPV / IRR Comparison
- Processes Break Even Comparison
- Processes Resources Time Comparison
- Processes Resources Cost Comparison
- Processes Classifier Duration Comparison
- Processes Classifier Cost Comparison
A window opens.
Select the second simulation results that you want to compare with the first results you selected and then click OK.
Select the type of process instances you want to include in the analysis:
- Succeeded process instances only
- Failed process instances only
- All process instances
If you selected the processes NPV / IRR comparison, complete the following steps in the window that appears:
1. Specify the Initial cost of the process, and optionally select a currency.
2. In the Number of process runs per year field, specify the number of times you expect the process to run within a single year. For example, enter 5000 to specify that the calculation will be based on an assumption that the process will running five thousand times each year.
3. In the Number of years field, specify the number of years you want the analysis to cover. For example, enter 2 to determine results based on two years of operation as the payback period.
4. Enter the Annual discount rate. For example, enter 10 to specify a discount rate of ten percent.
5. Click Finish.
If you selected the processes break even comparison, complete the following steps in the window that appears:
1. In the Process Volume field, enter the number of times you want to use as the estimated number of times the process will run in a given unit of time. Then, select the unit of time to use from the Time unit drop-down list. For example, if you want to estimate that the process will run 5 times each hour, select Process volume to 5 and Time unit to hour.
2. In the Initial cost field, enter the fixed cost value that you want to recover and select a currency type from the drop-down list.
3. Click Finish.

Now, you can view the results of the analysis in the Analysis view. You can also print a report of the results.

Processes duration comparison analysis
Processes duration comparison analysis compares the average duration and throughput of two processes based on the results of their simulation runs.
Processes activities total time comparison analysis
Processes activities total time comparison analysis compares the average duration of two processes based on the results of their simulation runs.
Processes cost comparison analysis
Processes cost comparison analysis compares the average cost and revenue results for two sets of process simulation results.
Processes NPV and IRR comparison analysis
Processes NPV and IRR comparison analysis compares process net present value (NPV) and internal rate of return (IRR) analysis results for two process simulations that use the same input parameters.
Processes break even comparison analysis
Processes break even comparison analysis compares the break even analysis results of two process simulations.
Processes resources time comparison analysis
Processes resources time comparison analysis compares the average resource allocation durations for two simulation results based on the same simulation snapshot. They can be results from different profiles, or two sets of results from the same profile.
Processes resources cost comparison analysis
Processes resources cost comparison analysis compares the average resource allocation costs for two simulation results based on the same simulation snapshot. They can be results from different profiles, or two sets of results from the same profile.
Processes classifier duration comparison analysis
Processes classifier duration comparison analysis compares the average classifier elapsed duration results for two process simulations that use the same input parameters.
Processes classifier cost comparison analysis
Processes classifier cost comparison analysis compares the average classifier cost results for two process simulations that use the same input parameters.