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Answer : D

The Deming Cycle (Plan-Do-Check-Act) is foundational to continuous improvement in Lean, and is specifically applied in the Improvement Kata practice:

Improvement Kata: A structured routine for continuous, incremental improvement based on scientific thinking (PDCA).

Value Stream Mapping and Andon cord are Lean practices, but they don't directly reference PDCA as the core mechanism.

Extract-style reference: ''The Improvement Kata incorporates the Deming cycle (Plan-Do-Check-Act) to drive small, rapid cycles of change, helping teams to experiment, learn, and adjust.'' --- Toyota Kata, Mike Rother PeopleCert DevOps Foundation v3.6: Cites PDCA as integral to continuous improvement and Lean/DevOps adoption.

Answer : C

A blame culture is toxic and inhibits innovation. DevOps encourages a culture where risk-taking and experimentation are rewarded, not punished. Organizations should 'build rituals that reward risk taking'---examples include celebrating ''fast failures'' and running blameless post-mortems.

Extract-style reference: ''Encourage a culture where failure is seen as a learning opportunity, not a cause for punishment. Rituals that reward risk-taking foster innovation and create psychological safety.'' --- DevOps Handbook DevOps Foundation v3.6 (Cultural Principles section) advocates psychological safety, learning from failure, and reward systems that incentivize experimentation.

Answer : C

The Thomas-Kilmann Conflict Mode Instrument (TKI) is a psychometric tool that measures an individual's behavior in conflict situations---specifically, how they handle disagreement with colleagues.

It classifies responses into five modes: Competing, Collaborating, Compromising, Avoiding, and Accommodating.

Why not the others?

Kubler Ross Change Curve: Describes emotional responses to change, not conflict styles.

Westrum's Typology: Categorizes organizational culture (pathological, bureaucratic, generative) but doesn't measure individual behavior.

Value Stream Mapping: A process improvement tool, not a behavioral assessment.

Reference/Extract: ''The Thomas-Kilmann instrument helps teams understand how individuals approach conflict and collaboration, enabling better resolution strategies---a key aspect of high-performing DevOps teams.'' --- DevOps Handbook; PeopleCert DevOps Foundation v3.6 Section 3.7

Answer : B

Deployment frequency is not a culture metric.

It's a process metric, indicating how often code is released.

Culture metrics focus on engagement, morale, retention, psychological safety, and NPS.

Why not the others?

Employee NPS: Measures employee satisfaction and willingness to recommend.

Engagement/morale: Direct indicators of cultural health.

Retention: How well an org keeps talented people, reflecting culture.

Extract-style reference: ''Measuring DevOps culture relies on employee engagement, morale, and retention, not on delivery metrics like deployment frequency.'' --- State of DevOps Report PeopleCert DevOps Foundation v3.6: Culture metrics focus on people, not just process.

Answer : A

A DevOps professional needs:

Business skills: Understanding the business context and value.

Technical skills: Automation, coding, cloud, infrastructure.

Core (soft) skills: Collaboration, communication, empathy, learning.

Self-management: Time, priorities, feedback.

Other options miss the full blend or focus too much on tech or process.

Extract-style reference:

''DevOps success requires a blend of business, technical, and core (soft) skills, as well as the ability to self-manage and continuously learn.''

--- DevOps Handbook; Accelerate

PeopleCert DevOps Foundation v3.6: Holistic skillsets are emphasized for cross-functional teams.