Interim vs Comprehensive Behaviour Support Plan: What’s the Difference?
When a participant is referred for NDIS behaviour support, one of the first decisions the practitioner makes is which type of plan to write first: an interim behaviour support plan vs comprehensive behaviour support plan. Both are valid clinical documents, but they serve different purposes, run on different timelines, and apply in different circumstances. This guide breaks down the difference so Support Coordinators, families and SIL providers know exactly what's being written and why.
What Is an Interim Behaviour Support Plan?
An interim behaviour support plan is a shorter, focused plan written when a participant needs behaviour support now — usually because there's immediate risk, or because regulated restrictive practices are already in place or being considered.
Interim plans are commonly used when:
- There is significant risk to the participant, staff, family or community.
- Chemical restraint or another regulated restrictive practice is already being used.
- A new participant has entered Supported Independent Living or a high-support setting and the team needs strategies immediately.
- A comprehensive plan is still being developed but the team cannot wait.
Interim plans are still written by an NDIS-suitable behaviour support practitioner, and they are registered with the NDIS Quality and Safeguards Commission in the same way as comprehensive plans.
What Is a Comprehensive Behaviour Support Plan?
A comprehensive behaviour support plan is the full evidence-based plan that follows a complete functional behaviour assessment. It contains the long-term strategies, reduction plans, and training structure that move a participant from crisis response to sustained change.
Comprehensive BSPs typically include:
- A detailed formulation of why behaviours of concern occur.
- Preventative, skill-building and response strategies.
- A clear plan to reduce or eliminate any restrictive practices over time.
- Training obligations for family, support workers and SIL staff.
- Monitoring and review commitments.
Key Differences at a Glance
The simplest way to hold the two plan types apart:
- Interim plans are about immediate safety. They're written fast, focus on the strategies most needed right now, and sit under a shorter lifespan (up to 6 months).
- Comprehensive plans are about long-term change. They take longer to write (typically 6–12 weeks — covered in detail in our BSP timeline blog), rest on a full assessment, and are reviewed at least every 12 months.
Both are person-centred. Both are evidence-based. The difference is scope and urgency, not quality.
How an Interim Plan Transitions to a Comprehensive Plan
One of the most common Support Coordinator questions: "Do we have to start the assessment again?" The short answer is no. A well-written interim plan is built from the same assessment data the comprehensive plan will need — interviews, observation, incident review, ABC analysis. The practitioner simply continues to build on that evidence as the comprehensive plan takes shape, without duplicated effort for the participant or family.
When the comprehensive plan is finalised, the interim plan is retired and the new document takes over. Where emotional regulation, trauma or mental health sit beneath behaviours of concern, our psychology team may also come in at this point as part of an integrated approach. Family-led communities such as Every Australian Counts consistently note that continuity matters more than speed — which is exactly why a well-structured interim-to-comprehensive transition works.
Which Plan Does Your Participant Need?
The short version:
- If there is urgent risk or active restrictive practices, start with an interim plan.
- If the presentation is complex but not urgent, go straight to a comprehensive plan.
- If you're unsure, that's exactly the conversation to have at intake — a good practitioner will tell you honestly which pathway makes sense, aligned with the broader NDIS Positive Behaviour Support framework.
Need help deciding between an interim and comprehensive BSP for your participant? Contact the AH2U team on 1300 24 2428.
Positive Behaviour Support
