Boehm&#x27;s Spiral Model

Spiral Model — Core Representation

1 pts

volume_mute

The diagram below shows a simplified view of Boehm's spiral model. Each loop in the spiral represents a phase of the software process, and each loop is divided into four sectors.

What is the key differentiating feature of the spiral model compared to other software process models?

It eliminates the need for any documentation throughout the project

It explicitly recognises risk and includes risk management activities to reduce those risks

It requires the complete system specification to be defined before any development begins

It represents the process as a strict sequence of phases with no iteration

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Four Sectors of Each Spiral Loop

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Please drag and drop the options to sort them

Each loop in the spiral model is split into four sectors. Sort them into the order in which they are described.

Planning

Risk assessment and reduction

Development and validation

Objective setting

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What Each Loop Represents

1 pts

volume_mute

In the spiral model, what does each loop in the spiral represent?

A single sprint of fixed duration

A single software release delivered to the customer

A complete cycle of the waterfall model

A phase of the software process

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Objective Setting Sector

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Complete the sentence about what happens in the objective setting sector of each spiral loop.

Specific objectives for that phase are defined, constraints on the process and product are identified, a detailed (1) is drawn up, project risks are identified, and alternative strategies depending on these risks may be (2).

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management plan

planned

draft

walkthrough

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Risk Assessment and Reduction

1 pts

volume_mute

What takes place during the risk assessment and reduction sector of a spiral loop?

For each identified project risk, a detailed analysis is carried out and steps are taken to reduce the risk — for example, developing a prototype if requirements may be inappropriate

The development model for the system is chosen based on what risks are dominant

The project is reviewed and a decision is made whether to continue to the next loop

Specific objectives for the phase are defined and a management plan is drawn up

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Choosing a Development Model in the Spiral

1 pts

volume_mute

In the spiral model's development and validation sector, how is the development model chosen?

It is chosen based on the dominant risk — for example, throwaway prototyping for UI risks, formal transformations for safety risks, or waterfall for sub-system integration risks

It is chosen by the customer at the start of the project and cannot be changed

It is always the waterfall model regardless of the risks identified

It is always an agile method because the spiral model is an agile framework

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Planning Sector — Continue or Stop?

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volume_mute

What happens in the planning sector at the end of each spiral loop?

All identified risks are resolved before moving on

The development model selected in the previous sector is formally approved

The final system is delivered to the customer

The project is reviewed and a decision is made whether to continue with a further loop of the spiral; if continuing, plans are drawn up for the next phase

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Informal Definition of Risk

1 pts

volume_mute

In the context of the spiral model, what is risk informally defined as?

The probability that the project will exceed its budget

Something that can go wrong

The number of unresolved requirements at any point in the process

A formal quantitative measure of project uncertainty

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Spiral Model Combines Two Strategies

1 pts

volume_mute

True or False: The spiral model combines both change avoidance and change tolerance.

True

False

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How a Spiral Cycle Begins

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Complete the sentence about how each cycle of the spiral begins.

A cycle of the spiral begins by elaborating (1) such as performance and functionality. Alternative ways of achieving these objectives are then enumerated, and each alternative is assessed against each objective to identify sources of (2).

Please drag and drop the selected option in the right place or type it instead

project risk

objectives

details

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Spiral Model — Core Representation

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Explanation

Four Sectors of Each Spiral Loop

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Explanation

What Each Loop Represents

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Objective Setting Sector

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Explanation

Risk Assessment and Reduction

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Explanation

Choosing a Development Model in the Spiral

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Explanation

Planning Sector — Continue or Stop?

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Explanation

Informal Definition of Risk

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Explanation

Spiral Model Combines Two Strategies

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Explanation

How a Spiral Cycle Begins

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