A SaaS schedule depends on unresolved decisions as well as engineering work. A credible plan separates discovery, prototyping, implementation, integrations and launch readiness, with explicit exit criteria for each stage.
Identify the critical path
List dependencies that block several tasks: API access, data-model decisions, stakeholder availability, content and migration inputs. Adding engineers does not necessarily resolve an unavailable external dependency. Give each blocker an owner and a date for verification.
Estimate usable milestones
Break the product into testable journeys. “Authentication complete” is less informative than “a user can create an account, recover access and join the correct organisation.” Include testing, acceptance feedback and corrections in the milestone rather than leaving them for an undefined period after delivery.
A scope decision in practice
Suppose a fictional product depends on a partner synchronisation whose test access is uncertain. A standard import may let the team evaluate the core workflow first. This does not eliminate future integration effort; it separates product validation from that dependency. Explain the limitation to pilot users.
Review the plan with concrete questions
- Which product decisions are still open?
- Which dependencies are genuinely available?
- What complete journey can be shown next?
- Who accepts the work, and how quickly?
- Which identified risks need contingency?
Can a launch date be guaranteed?
A team can commit to a date against explicit scope and conditions. If scope changes, tradeoffs need to remain possible. Ask what would be reduced under pressure instead of accepting a promise to deliver everything without compromise.
Derive the schedule from dependencies
In a fictional plan, design takes five working days, an integration eight and acceptance three. Their sum is not a reliable launch date: supplier access may take two weeks while content work proceeds in parallel. Distinguish effort, available capacity and waiting time. The longest chain of dependencies constrains delivery; headcount alone does not determine it.
Give every milestone an entry condition and exit evidence. Integration work starts when credentials and representative test data exist. It finishes when failure and retry behaviour have been checked. “Almost done” is not a dependable state for scheduling the next step.
Respond to a schedule change
- Identify whether scope, assumptions, availability or defects changed.
- Assess downstream effects, not just the delayed task.
- Compare postponement, a coherent scope reduction and a manual alternative.
- Record the decision owner and the next verification point.
Adding contributors can increase coordination work instead of shortening delivery. First establish whether the remaining work can be separated and whether someone has capacity to review it. For international teams, also make approval windows and time-zone overlap explicit.
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A SaaS is a system: data, users, permissions, billing and operations. Its architecture should support the business model.
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