MLOps Engineer · 10+ Years
Platform standards, governance, operating model, metrics, mentoring, and decision frameworks.
Try each answer before revealing the suggested coaching answer.
25 questions
01How would you standardize ML lifecycle stages across multiple teams as a technical lead or architect?
A technical-leadership answer
Say this first: ML lifecycle stages should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply ML lifecycle stages, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → ML lifecycle stages → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
02How would you define governance, ownership, and success metrics for experiment tracking?
A technical-leadership answer
Say this first: experiment tracking should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply experiment tracking, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → experiment tracking → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
03A leadership team asks you to improve maturity around model registry. What roadmap would you propose?
A technical-leadership answer
Say this first: model registry should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply model registry, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → model registry → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
04How would you balance delivery speed, risk, cost, and maintainability for feature store?
A technical-leadership answer
Say this first: feature store should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply feature store, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → feature store → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
05How would you mentor teams that use data versioning inconsistently across projects?
A technical-leadership answer
Say this first: data versioning should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply data versioning, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Concrete check
SELECT COUNT(*) AS rows, MAX(loaded_at) AS freshest FROM <table>;Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → data versioning → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
06How would you standardize model versioning across multiple teams as a technical lead or architect?
A technical-leadership answer
Say this first: model versioning should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply model versioning, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → model versioning → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
07How would you define governance, ownership, and success metrics for training-serving skew?
A technical-leadership answer
Say this first: training-serving skew should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply training-serving skew, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → training-serving skew → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
08A leadership team asks you to improve maturity around CI/CD for ML. What roadmap would you propose?
A technical-leadership answer
Say this first: Continuous integration validates small changes frequently. Continuous delivery keeps a validated release ready to deploy; continuous deployment automatically releases changes that meet the agreed gates.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply CI/CD for ML, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → CI/CD for ML → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
09How would you balance delivery speed, risk, cost, and maintainability for continuous training?
A technical-leadership answer
Say this first: continuous training should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply continuous training, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → continuous training → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
10How would you mentor teams that use model deployment strategies inconsistently across projects?
A technical-leadership answer
Say this first: model deployment strategies should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply model deployment strategies, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → model deployment strategies → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
11How would you standardize shadow deployment across multiple teams as a technical lead or architect?
A technical-leadership answer
Say this first: shadow deployment should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply shadow deployment, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → shadow deployment → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
12How would you define governance, ownership, and success metrics for canary model rollout?
A technical-leadership answer
Say this first: canary model rollout should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply canary model rollout, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → canary model rollout → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
13A leadership team asks you to improve maturity around A/B testing models. What roadmap would you propose?
A technical-leadership answer
Say this first: A/B testing models should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply A/B testing models, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Concrete check
npm test -- --runInBandEvidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → A/B testing models → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
14How would you balance delivery speed, risk, cost, and maintainability for model monitoring?
A technical-leadership answer
Say this first: model monitoring should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply model monitoring, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → model monitoring → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
15How would you mentor teams that use data drift detection inconsistently across projects?
A technical-leadership answer
Say this first: data drift detection should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply data drift detection, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Concrete check
SELECT COUNT(*) AS rows, MAX(loaded_at) AS freshest FROM <table>;Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → data drift detection → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
16How would you standardize concept drift detection across multiple teams as a technical lead or architect?
A technical-leadership answer
Say this first: concept drift detection should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply concept drift detection, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → concept drift detection → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
17How would you define governance, ownership, and success metrics for model rollback?
A technical-leadership answer
Say this first: model rollback should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply model rollback, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → model rollback → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
18A leadership team asks you to improve maturity around pipeline orchestration. What roadmap would you propose?
A technical-leadership answer
Say this first: pipeline orchestration should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply pipeline orchestration, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Concrete check
SELECT COUNT(*) AS rows, MAX(loaded_at) AS freshest FROM <table>;Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → pipeline orchestration → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
19How would you balance delivery speed, risk, cost, and maintainability for batch vs real-time inference?
A technical-leadership answer
Say this first: batch vs real-time inference is a choice between approaches with different strengths. The useful answer is the decision rule, not a dictionary definition.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply batch vs real-time inference, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- Choose the option that fits the workload and constraints; do not present one option as universally superior.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → batch vs real-time inference → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
20How would you mentor teams that use model packaging with Docker inconsistently across projects?
A technical-leadership answer
Say this first: model packaging with Docker should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply model packaging with Docker, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → model packaging with Docker → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
21How would you standardize Kubernetes for model serving across multiple teams as a technical lead or architect?
A technical-leadership answer
Say this first: Kubernetes for model serving should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply Kubernetes for model serving, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Concrete check
kubectl rollout status deployment/<service> --timeout=90sEvidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → Kubernetes for model serving → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
22How would you define governance, ownership, and success metrics for reproducibility?
A technical-leadership answer
Say this first: reproducibility should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply reproducibility, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → reproducibility → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
23A leadership team asks you to improve maturity around model lineage and audit. What roadmap would you propose?
A technical-leadership answer
Say this first: model lineage and audit should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply model lineage and audit, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → model lineage and audit → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
24How would you balance delivery speed, risk, cost, and maintainability for ML security and access control?
A technical-leadership answer
Say this first: ML security and access control should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply ML security and access control, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Concrete check
Review the least-privilege policy, then test the denied path as well as the allowed path.Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → ML security and access control → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
25How would you mentor teams that use cost optimization for training inconsistently across projects?
A technical-leadership answer
Say this first: cost optimization for training should be explained through its purpose, the boundary where it applies, and the evidence that shows it is working.
Use a real scenario
Imagine an internal support assistant that answers from approved policy documents. The team must decide how to apply cost optimization for training, verify the result, and explain the user impact. For a MLOps Engineer, attach the explanation to an evaluation set and retrieval trace.
Show judgment
- make the decision criteria visible across teams and create a safe default path.
- State the constraint that could change your decision, such as scale, data sensitivity, recovery target, or team ownership.
- Call out prompt injection and unsupported answers and the control that reduces it.
Evidence to mention
Track grounded-answer rate and p95 response time. Say what baseline you compared against, what would trigger a rollback or escalation, and who owns the follow-up.
request or change → guardrail / validation → cost optimization for training → observable result → owner reviewPractice prompt: Explain the escalation route when prompt injection and unsupported answers conflicts with delivery pressure.
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Further reading
These are original practice questions and suggested answers. Adapt them to your own work and explain evidence, trade-offs, and limitations.