Software development lifecycle in Intro to Computing - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Identify the correct order of SDLC phases

Which of the following lists the Software Development Lifecycle (SDLC) phases in the correct order from start to finish?

A 3,6,1,2,5,4

B 1,3,6,2,4,5

C 3,1,6,2,4,5

D 3,1,2,6,4,5

💡 Hint

Think about gathering needs before designing and coding.

The correct SDLC order starts with Requirement Analysis (3), then Design (1), Implementation (6), Testing (2), Deployment (4), and finally Maintenance (5).

❓ trace

intermediate

Trace the SDLC phase for a scenario

A team is fixing bugs found after releasing the software to users. Which SDLC phase are they in?

A Maintenance

B Requirement Analysis

C Testing

D Design

💡 Hint

This phase happens after deployment to keep software working well.

Maintenance is the phase where bugs found after deployment are fixed and software is updated.

❓ Comparison

advanced

Compare Waterfall and Agile SDLC models

Which statement correctly compares Waterfall and Agile models in SDLC?

A Waterfall is linear and sequential; Agile is iterative and flexible.

B Waterfall delivers software in small parts; Agile delivers all at once.

C Agile has no testing phase; Waterfall tests continuously.

D Waterfall allows changes anytime; Agile requires all requirements upfront.

💡 Hint

Think about how each model handles phases and changes.

Waterfall follows a strict linear sequence of phases, while Agile works in repeated cycles allowing flexibility and changes.

❓ identification

advanced

Identify the SDLC phase from a flowchart

Look at the flowchart steps:
1. Gather user needs
2. Create blueprints
3. Write code
4. Run tests
5. Release software
6. Fix issues after release

Which phase corresponds to step 2?

A Requirement Analysis

B Implementation

C Testing

D Design

💡 Hint

Blueprints are like plans or drawings before building.

Step 2 is Design, where the software's structure and details are planned before coding.

🚀 Application

expert

Determine the impact of skipping Testing phase

If a software project skips the Testing phase and moves directly from Implementation to Deployment, what is the most likely outcome?

A The software will run faster without testing overhead.

B Users may encounter many errors and crashes after deployment.

C Software will have fewer bugs because testing wastes time.

D Maintenance phase will be unnecessary since testing was skipped.

💡 Hint

Testing helps find problems before users see them.

Skipping Testing means bugs and errors are not found early, causing users to face issues after deployment.

Practice

1. Which phase of the Software Development Lifecycle (SDLC) involves gathering and understanding what the users need from the software?

easy

A. Requirement Analysis

B. Testing

C. Deployment

D. Maintenance

Solution

1. Step 1: Understand the purpose of each SDLC phase

   Requirement Analysis is the phase where the team collects and understands user needs.

2. Step 2: Match the phase to the description

   Since gathering user needs is the focus, Requirement Analysis fits best.

3. Final Answer:

   Requirement Analysis -> Option A

4. Quick Check:

   Gathering needs = Requirement Analysis [OK]

Hint: User needs are gathered in Requirement Analysis phase [OK]

Common Mistakes:

• Confusing Testing with gathering requirements
• Thinking Deployment is for collecting needs
• Mixing Maintenance with initial planning

2. Which of the following is the correct order of the first three phases in the Software Development Lifecycle?

easy

A. Design, Requirement Analysis, Implementation

B. Requirement Analysis, Design, Implementation

C. Implementation, Testing, Deployment

D. Testing, Deployment, Maintenance

Solution

1. Step 1: Recall the standard SDLC order

   The first three phases are Requirement Analysis, then Design, then Implementation.

2. Step 2: Compare options with the correct order

   Requirement Analysis, Design, Implementation matches the correct sequence exactly.

3. Final Answer:

   Requirement Analysis, Design, Implementation -> Option B

4. Quick Check:

   First phases order = D [OK]

Hint: Remember: Analyze needs, then design, then build [OK]

Common Mistakes:

• Mixing Design before Requirement Analysis
• Starting Implementation too early
• Confusing Testing as an early phase

3. Consider this simplified SDLC flowchart:



If a bug is found during Testing, which phase does the process return to?

medium

A. Implementation

B. Design

C. Requirement Analysis

D. Deployment

Solution

1. Step 1: Analyze the flowchart's Testing phase

   The flowchart shows that if bugs are found during Testing, the process loops back to Implementation.

2. Step 2: Understand why it returns to Implementation

   Bugs require fixing code, which happens in Implementation phase.

3. Final Answer:

   Implementation -> Option A

4. Quick Check:

   Bug found in Testing -> fix in Implementation [OK]

Hint: Fix bugs by returning to Implementation phase [OK]

Common Mistakes:

• Thinking bugs send process back to Requirement Analysis
• Assuming Design phase is for bug fixes
• Confusing Deployment with bug fixing

4. A developer wrote this SDLC phase order:

Requirement Analysis -> Implementation -> Design -> Testing -> Deployment

What is wrong with this order?

medium

A. Testing should come before Design

B. Requirement Analysis should come after Implementation

C. Deployment should come before Testing

D. Design should come before Implementation

Solution

1. Step 1: Review the correct SDLC order

   The correct order is Requirement Analysis, Design, Implementation, Testing, Deployment.

2. Step 2: Identify the misplaced phase

   Implementation is placed before Design, which is incorrect; Design must come before Implementation.

3. Final Answer:

   Design should come before Implementation -> Option D

4. Quick Check:

   Design before Implementation [OK]

Hint: Design always precedes Implementation [OK]

Common Mistakes:

• Swapping Implementation and Design order
• Placing Testing before Design
• Misordering Deployment and Testing

5. A software team wants to improve user satisfaction by reducing bugs after deployment. Which SDLC phase should they focus on enhancing to catch bugs earlier?

hard

A. Deployment

B. Requirement Analysis

C. Testing

D. Maintenance

Solution

1. Step 1: Understand the goal of reducing bugs after deployment

   Reducing bugs after deployment means catching them earlier in the process.

2. Step 2: Identify the phase responsible for finding bugs

   Testing phase is designed to find and fix bugs before deployment.

3. Final Answer:

   Testing -> Option C

4. Quick Check:

   Catch bugs early in Testing phase [OK]

Hint: Improve Testing to catch bugs before deployment [OK]

Common Mistakes:

• Thinking Deployment phase fixes bugs
• Confusing Maintenance with pre-deployment bug fixing
• Assuming Requirement Analysis finds bugs