Planet RoadmapEvery project has tasks that depend on other tasks. Ignoring these dependencies leads to blocked work, missed deadlines, and frustrated teams. Understanding the types of dependencies and how to manage them is essential for keeping projects on track.
The Four Types of Dependencies
Project management defines four dependency types based on the relationship between the start and finish of connected tasks. Knowing which type you are dealing with helps you schedule work and spot risks early.
- Finish-to-Start (FS): Task B cannot start until Task A finishes. The most common type—for example, you cannot deploy until tests pass.
- Start-to-Start (SS): Task B cannot start until Task A starts. Both tasks run in parallel but must kick off together.
- Finish-to-Finish (FF): Task B cannot finish until Task A finishes. Both tasks can run concurrently but must complete together.
- Start-to-Finish (SF): Task B cannot finish until Task A starts. Rare in software, but sometimes used in shift handoffs.
Internal vs External Dependencies
Internal dependencies exist within your team—one developer's API work blocking another's frontend integration. External dependencies involve other teams, vendors, or third-party services. External dependencies carry more risk because you have less control over their timeline. Identify them early and build buffer into your schedule.
Best Practices for Managing Dependencies
Visualize dependencies on your project board so the whole team can see what is blocked and why. During sprint planning, explicitly call out tasks that depend on other work and sequence them accordingly. When possible, break large dependent chains into smaller, independently deliverable pieces.
Avoid creating unnecessary dependencies. If two features can be built and shipped independently, do not tie them together just for convenience. Every dependency is a potential bottleneck.
Tooling That Helps
Planet Roadmap lets you link tasks with dependency relationships and surfaces blocked items automatically. When a dependency is resolved, downstream tasks become actionable immediately. This visibility prevents the common problem of work sitting idle because nobody realized the blocker was already cleared.