- 1st/2nd/3rd line support, Follow the Sun Support
- 4 eyes principle
- 5-whys
- 24/7 support
- Acceptance
- Acceptance criteria
- Acceptance environment
- Accessability
- Account management
- Account manager
- Accountability_
- Activity
- Adjustment
- Affinity mapping
- Agile
- Anglo-Saxon
- Agree
- Alert
- Anglo-American
- Antecedent
- Applicant
- Application form
- Architecture
- Architecture pattern
- Artefact
- Asset
- Asset register
- Attribute
- Audit
- Availability
- Availability management
- Availability manager
- Availability window
- Back-loop
- Back office
- Backout
- Balanced scorecard
- Baseline
- Benchmark
- Benchmarking
- Best effort
- Best practice
- Big bang
- BPM tool
- BPMN notation
- Brainstorm
- Budget control
- Build
- Building block
- Building information model (BIM)