pressman-ch-25-chapte risk-management.ppt

Chapter 25
Risk Management
- Introduction
- Risk identification
- Risk projection (estimation)
- Risk mitigation, monitoring, and
management
(Source: Pressman, R. Software Engineering: A Practitioner’s Approach. McGraw-Hill, 2005)

2
Project Risks
What can go wrong?
What is the likelihood?
What will the damage be?
What can we do about it?

What Is Software Risk?
• Risk is an expectation of loss, a potential problem
that may or may not occur in the future.
• It is generally caused due to lack of information,
control or time.
• A possibility of suffering from loss in software
development process is called a software risk.
• Loss can be anything, increase in production cost,
development of poor quality software, not being
able to complete the project on time.
4

Types of software risks
• Software risk exists because the future is
uncertain and there are many known and
unknown things that cannot be incorporated
in the project plan.
• A software risk can be of two types
– (1) internal risks that are within the control of
the project manager and
– (2) external risks that are beyond the control of
project manager. 5

6
Definition of Risk
• A risk is a potential problem – it might happen and it might not
• Conceptual definition of risk
– Risk concerns future happenings
– Risk involves change in mind, opinion, actions, places, etc.
– Risk involves choice and the uncertainty that choice entails
• Two characteristics of risk
– Uncertainty – the risk may or may not happen, that is, there are no 100%
risks (those, instead, are called constraints)
– Loss – the risk becomes a reality and unwanted consequences or losses
occur

7
Risk Categorization – Approach #1
• Project risks
– They threaten the project plan
– If they become real, it is likely that the project schedule will slip and that
costs will increase
• Technical risks
– They threaten the quality and timeliness of the software to be produced
– If they become real, implementation may become difficult or impossible
• Business risks
– They threaten the viability of the software to be built
– If they become real, they jeopardize the project or the product
(More on next slide)

8
(continued)
• Sub-categories of Business risks
– Market risk – building an excellent product or system that no one really
wants
– Strategic risk – building a product that no longer fits into the overall
business strategy for the company
– Sales risk – building a product that the sales force doesn't understand how
to sell
– Management risk – losing the support of senior management due to a
change in focus or a change in people
– Budget risk – losing budgetary or personnel commitment

9
• Known risks
– Those risks that can be uncovered after careful evaluation of the project plan,
the business and technical environment in which the project is being
developed, and other reliable information sources (e.g., unrealistic delivery
date)
• Predictable risks
– Those risks that are extrapolated from past project experience (e.g., past
turnover)
• Unpredictable risks
– Those risks that can and do occur, but are extremely difficult to identify in
advance

Risk Management
• Risk management is carried out to:
– Identify the risk
– Reduce the impact of risk
– Reduce the probability or likelihood of risk
– Risk monitoring
10
Risk
monitoring
Reduce the
probability
or likelihood
of risk
Reduce the
impact of
risk
Identify the
risk

11
Reactive vs. Proactive
Risk Strategies
• Reactive risk strategies
– "Don't worry, I'll think of something"
– The majority of software teams and managers rely on this approach
– Nothing is done about risks until something goes wrong
• The team then flies into action in an attempt to correct the problem
rapidly (fire fighting)
– Crisis management is the choice of management techniques
• Proactive risk strategies
– Steps for risk management are followed (see next slide)
– Primary objective is to avoid risk and to have a contingency plan in
place to handle unavoidable risks in a controlled and effective
manner

12
Steps for Risk Management
1) Identify possible risks; recognize what can go wrong
2) Analyze each risk to estimate the probability that it will occur and
the impact (i.e., damage) that it will do if it does occur
3) Rank the risks by probability and impact
- Impact may be negligible, marginal, critical, and catastrophic
4) Develop a contingency plan to manage those risks having high
probability and high impact

13
Steps for Risk Management
Identify possible risks; recognize what can go wrong
Analyze each risk to estimate the probability that it
will occur and the impact (i.e., damage) that it will
do if it does occur
Rank the risks by probability and impact
- Impact may be negligible, marginal, critical, and
catastrophic
Develop a contingency plan to manage those risks
having high probability and high impact

15
Background
• Risk identification is a systematic attempt to specify threats to the
project plan
• By identifying known and predictable risks, the project manager takes
a first step toward avoiding them when possible and controlling them
when necessary
• Generic risks
– Risks that are a potential threat to every software project
• Product-specific risks
– Risks that can be identified only by those a with a clear understanding of
the technology, the people, and the environment that is specific to the
software that is to be built
– This requires examination of the project plan and the statement of scope
– "What special characteristics of this product may threaten our project
plan?"

16
Risk Item Checklist
Used as one way to identify risks
Focuses on known and predictable risks in
specific subcategories (see next slide)
Can be organized in several ways
•A list of characteristics relevant to each risk subcategory
•Questionnaire that leads to an estimate on the impact of each
risk
•A list containing a set of risk component and drivers and their
probability of occurrence

17
Known and Predictable Risk Categories
1-Product size risks associated with overall size of the software to be built
2-Business
impact
risks associated with constraints imposed by management or the marketplace
3-Customer
characteristics
risks associated with sophistication of the customer and the developer's ability to
communicate with the customer in a timely manner
4-Process
definition
risks associated with the degree to which the software process has been defined and
is followed
5-Development
environment
risks associated with availability and quality of the tools to be used to build the
project
6-Technology to
be built
risks associated with complexity of the system to be built and the "newness" of the
technology in the system
7-Staff size and
experience
risks associated with overall technical and project experience of the software
engineers who will do the work

Recording Risk
Information
These courseware materials are
to be used in conjunction with
18
Project: Embedded software for XYZ system
Risk type: schedule risk
Priority (1 low ... 5 critical): 4
Risk factor: Project completion will depend on tests which
require
hardware component under development. Hardware component
delivery may be delayed
Probability: 60 %
Impact: Project completion will be delayed for each day that
hardware is unavailable for use in software testing
Monitoring approach:
Scheduled milestone reviews with hardware group
Contingency plan:
Modification of testing strategy to accommodate delay using
software simulation
Estimated resources: 6 additional person months beginning 7-1-
96

19
Questionnaire on Project Risk
1) Have top software and customer managers formally committed to
support the project?
2) Are end-users enthusiastically committed to the project and the
system/product to be built?
3) Are requirements fully understood by the software engineering team
and its customers?
4) Have customers been involved fully in the definition of
requirements?
5) Do end-users have realistic expectations?
6) Is the project scope stable?
(Questions are ordered by their relative importance to project success)

20
Questionnaire on Project Risk
(continued)
7) Does the software engineering team have the right mix of skills?
8) Are project requirements stable?
9) Does the project team have experience with the technology to be
implemented?
10) Is the number of people on the project team adequate to do the job?
11) Do all customer/user constituencies agree on the importance of the
project and on the requirements for the system/product to be built?

21
Risk Components and Drivers
• The project manager identifies the risk drivers that affect the following risk
components
– Performance risk - the degree of uncertainty that the product will meet its
requirements and be fit for its intended use
– Cost risk - the degree of uncertainty that the project budget will be maintained
– Support risk - the degree of uncertainty that the resultant software will be easy
to correct, adapt, and enhance
– Schedule risk - the degree of uncertainty that the project schedule will be
maintained and that the product will be delivered on time
• The impact of each risk driver on the risk component is divided into one of
four impact levels
– Negligible, marginal, critical, and catastrophic
• Risk drivers can be assessed as impossible, improbable, probable, and
frequent

23
Background
• Risk projection (or estimation) attempts to rate each risk in two ways
– The probability that the risk is real
– The consequence of the problems associated with the risk, should it occur
• The project planner, managers, and technical staff perform four risk
projection steps (see next slide)
• The intent of these steps is to consider risks in a manner that leads to
prioritization
• By prioritizing risks, the software team can allocate limited resources
where they will have the most impact

24
Risk Projection/Estimation Steps
1) Establish a scale that reflects the perceived
likelihood of a risk (e.g., 1-low, 10-high)
2) Delineate the consequences of the risk
3) Estimate the impact of the risk on the project
and product
4) Note the overall accuracy of the risk projection
so that there will be no misunderstandings

25
Contents of a Risk Table
• A risk table provides a project manager with a simple technique for
risk projection
• It consists of five columns
– Risk Summary – short description of the risk
– Risk Category – one of seven risk categories (slide 12)
– Probability – estimation of risk occurrence based on group input
– Impact – (1) catastrophic (2) critical (3) marginal (4) negligible
– RMMM – Pointer to a paragraph in the Risk Mitigation, Monitoring, and
Management Plan
Risk Summary Risk Category Probability Impact (1-4) RMMM

26
Developing a Risk Table
• List all risks in the first column (by way of the help of the risk item
checklists)
• Mark the category of each risk
• Estimate the probability of each risk occurring
• Assess the impact of each risk based on an averaging of the four risk
components to determine an overall impact value (See next slide)
• Sort the rows by probability and impact in descending order
• Draw a horizontal cutoff line in the table that indicates the risks that
will be given further attention

27
Assessing Risk Impact
• Three factors affect the consequences that are likely if a risk
does occur
– Its nature – This indicates the problems that are likely if the risk occurs
– Its scope – This combines the severity of the risk (how serious was it)
with its overall distribution (how much was affected)
– Its timing – This considers when and for how long the impact will be felt
• The overall risk exposure formula is RE = P x C
– P = the probability of occurrence for a risk
– C = the cost to the project should the risk actually occur
• Example
– P = 80% probability that 18 of 60 software components will have to be
developed
– C = Total cost of developing 18 components is $25,000
– RE = .80 x $25,000 = $20,000

Risk Mitigation, Monitoring, and
Management

29
Background
• An effective strategy for dealing with risk must consider three issues
(Note: these are not mutually exclusive)
– Risk mitigation (i.e., avoidance)
– Risk monitoring
– Risk management and contingency planning
• Risk mitigation (avoidance) is the primary strategy and is achieved
through a plan
– Example: Risk of high staff turnover (see next slide)

30
 Meet with current staff to determine causes for turnover (e.g., poor
working conditions, low pay, competitive job market)
 Mitigate those causes that are under our control before the project starts
 Once the project commences, assume turnover will occur and develop
techniques to ensure continuity when people leave
 Organize project teams so that information about each development
activity is widely dispersed
 Define documentation standards and establish mechanisms to ensure that
documents are developed in a timely manner
 Conduct peer reviews of all work (so that more than one person is "up to
speed")
 Assign a backup staff member for every critical technologist
Strategy for Reducing Staff Turnover
Background (continued)

31
• During risk monitoring, the project manager monitors factors that may
provide an indication of whether a risk is becoming more or less likely
• Risk management and contingency planning assume that mitigation
efforts have failed and that the risk has become a reality
• RMMM steps incur additional project cost
– Large projects may have identified 30 – 40 risks
• Risk is not limited to the software project itself
– Risks can occur after the software has been delivered to the user

32
• Software safety and hazard analysis
– These are software quality assurance activities that focus on the
identification and assessment of potential hazards that may affect software
negatively and cause an entire system to fail
– If hazards can be identified early in the software process, software design
features can be specified that will either eliminate or control potential
hazards

33
The RMMM Plan
• The RMMM plan may be a part of the software development plan or
may be a separate document
• Once RMMM has been documented and the project has begun, the risk
mitigation, and monitoring steps begin
– Risk mitigation is a problem avoidance activity
– Risk monitoring is a project tracking activity
• Risk monitoring has three objectives
– To assess whether predicted risks do, in fact, occur
– To ensure that risk aversion steps defined for the risk are being properly
applied
– To collect information that can be used for future risk analysis
• The findings from risk monitoring may allow the project manager to
ascertain what risks caused which problems throughout the project

34
Seven Principles of Risk Management
View software risks within the context of a system and the business
problem that is intended to solve
Maintain a global
perspective
Think about risks that may arise in the future; establish contingency plans
Take a forward-looking
view
Encourage all stakeholders and users to point out risks at any time
Encourage open
communication
Integrate the consideration of risk into the software process
Integrate risk
management
Modify identified risks as more becomes known and add new risks as better
insight is achieved
Emphasize a
continuous process of
risk management
A shared vision by all stakeholders facilitates better risk identification and
assessment
Develop a shared
product vision
Pool the skills and experience of all stakeholders when conducting risk
management activities
Encourage teamwork
when managing risk

35
Summary
• Whenever much is riding on a software project, common sense dictates risk
analysis
– Yet, most project managers do it informally and superficially, if at all
• However, the time spent in risk management results in
– Less upheaval during the project
– A greater ability to track and control a project
– The confidence that comes with planning for problems before they occur
• Risk management can absorb a significant amount of the project planning
effort…but the effort is worth it


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