# Section 5: Overview of ISO 27001 requirements

Part 1: Context and Leadership
- [Clause 4: Context of the organization](PECB%2027001%20LA%20S05%20E01a%20-%20Context%20of%20the%20organization.md)
- [Clause 5: Leadership](PECB%2027001%20LA%20S05%20E01b%20-%20Leadership.md)

Part 2: Planning
- [Clause 6.1: Actions to address risks and opportunities](PECB%2027001%20LA%20S05%20E02a%20-%20Risk%20assessment%20and%20analysis.md)
- [Clause 6.2 Information security objectives and planning to achieve them](PECB%2027001%20LA%20S05%20E02b%20-%20Objectives%20and%20planning.md)
- [Clause 6.3: Planning of changes](PECB%2027001%20LA%20S05%20E02c%20-%20Planning%20of%20changes.md)

Part 3: Treatment
- [Clause 6.1.3: Information security risk treatment](PECB%2027001%20LA%20S05%20E03a%20-%20Risk%20treatment.md)

Part 4: Support – building blocks of the ISMS
- [Clause 7.1: Resources](PECB%2027001%20LA%20S05%20E04%20-%20Support%20-%20building%20blocks%20of%20the%20ISMS.md#Resources)
- [Clause 7.2: Competence](PECB%2027001%20LA%20S05%20E04%20-%20Support%20-%20building%20blocks%20of%20the%20ISMS.md#Competence)
- [Clause 7.3: Awareness](PECB%2027001%20LA%20S05%20E04%20-%20Support%20-%20building%20blocks%20of%20the%20ISMS.md#Awareness)
- [Clause 7.4: Communication](PECB%2027001%20LA%20S05%20E04%20-%20Support%20-%20building%20blocks%20of%20the%20ISMS.md#Communication)
- [Clause 7.5: Documented information](PECB%2027001%20LA%20S05%20E04%20-%20Support%20-%20building%20blocks%20of%20the%20ISMS.md#Documented%20information)

Part 5: Operation
- [Clause 8: Operation](PECB%2027001%20LA%20S05%20E05a%20-%20Operation.md)
- [Clause 9: Performance evaluation](PECB%2027001%20LA%20S05%20E05b%20-%20Performance%20evaluation.md)
- [Clause 10: Improvement](PECB%2027001%20LA%20S05%20E05c%20-%20Improvement.md)

