224 Part III: Executing Your Software Project Plan time, and quality. To obtain the risk assignment, you multiply the probability by the impact: P I = RA. Table 10-2 shows an example impact matrix. Table 10-2 Risk Probability and Impact Matrix Risk Probability Impact Risk Assignment Technology becoming obsolete .6 .9 .54 Key resource leaving project .3 .8 .24 Execs changing direction .4 .8 .32 Major bugs in software .4 .7 .28 The first column in the risk probability and impact matrix lists each identifiable risk. The second column, probability, indicates, in a decimal format, how likely a risk is to occur. For example, if you determine that there is a 60 percent probability that technology will become obsolete, you enter a .6 in this column. Probability should always be listed as a number between 0.0 (no probability) and 1.0 (100 percent certainty). The third column, impact, assigns a number to the impact of an event occurring. For example, your organization may say that any event that will have a high impact should be assigned a .9 or 1, and anything with a relatively low impact should be assigned a value somewhere between .1 and .3. To determine the probability and impact of a risk, you should use expert judgment and gather information from other stakeholders who have knowledge and expertise regarding your software project. Monitoring and Controlling Risks Risk monitoring and control is the last risk management planning process listed in Table 10-1. After you identify your project s risks, perform qualitative and quantitative analyses, document your risk management plan, and define your responses to the risks, you can start working on the project. Along the way, you will be monitoring and controlling your risks. You may create a database or register to keep track of each previously identified risk, identify and document new risks, and track the response plans for each risk. There may even be instances where a risk that you documented at the start of the project is no longer valid; you should make revisions to your risk management plan to address this change.
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