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Successor Activity

An activity that relies on a predecessor and is scheduled to occur after that earlier task in the sequence of work.

Key Points

  • It follows at least one predecessor and its timing is influenced by that predecessor.
  • Its relationship to the predecessor can be finish-to-start, start-to-start, finish-to-finish, or start-to-finish, with possible leads or lags.
  • Identifying successors is essential for network diagrams and critical path analysis.
  • Changes to a predecessor's dates or duration usually shift the successor's early and late start/finish dates.

Example

"Install wiring" is a successor to "Run conduit" in a finish-to-start relationship with a 1-day lag. Once conduit is complete, the wiring task can begin after the lag.

PMP Example Question

In a finish-to-start relationship with a 2-day lag, which activity begins after the predecessor finishes and the lag has elapsed?

  1. Predecessor activity
  2. Successor activity
  3. Milestone
  4. Control account

Correct Answer: B — the activity that follows and depends on the prior task

Explanation: The successor starts only after the predecessor completes (plus any lead/lag), making option B correct.

ICS/OT Cybersecurity Fundamentals — Security Built for Industrial Systems

Industrial control systems cannot be secured like ordinary IT. A forced reboot, aggressive scan, or incompatible patch can interrupt production and create real safety consequences. Effective OT security begins with understanding the systems, constraints, and risks unique to industrial environments.

This course gives IT professionals, engineers, operators, and security practitioners a practical foundation in ICS threats, zone and conduit design, risk assessment, passive asset visibility, and vendor evaluation. You will learn how IEC 62443, NIST CSF, and MITRE ATT&CK for ICS apply where availability and safety come first.

Eight reconstructed incidents—including Stuxnet, Triton, Ukraine 2015, Colonial Pipeline, and PIPEDREAM—show how attackers move through OT environments, what they target, and which defenses could have changed the outcome.

Watch the course preview, then build the vocabulary, frameworks, and judgment needed to take credible first steps in ICS/OT cybersecurity.

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ICS/OT Cybersecurity Fundamentals course preview

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