Published by Unseen Progress, an independent publisher of caregiver research. Last reviewed 2026-05-10. Part of the child anxiety research overview.
Short answer. Most ERP courses that feel like they aren't working at the eight-week mark actually are. The research on exposure-based treatment for childhood anxiety and OCD (Walkup et al., CAMS, 2008; POTS Team, 2004; Silverman et al., 2008) shows a systematic gap between what parents perceive and what clinicians measure, and that gap is widest in the early-to-middle weeks of treatment — exactly when parents are most tempted to conclude the treatment has failed. The signals that distinguish a working course from a stalled one are specific, observable, and almost never the ones parents are weighing day to day.
Silverman and colleagues (2008), reviewing two decades of evidence-based psychosocial treatments for childhood anxiety, document a recurring finding: parent-rated child severity and clinician-rated severity diverge sharply during the active phase of exposure-based treatment. Parents typically underestimate improvement, particularly in the first half of a manualised course. The reason is mechanical, not motivational. ERP works through habituation — the brain's natural reduction of anxiety response when a feared stimulus is faced without escape — and habituation has a counterintuitive signature. In-session distress rises before it falls. Functional gains lag the internal change by weeks.
The CAMS trial (Walkup et al., 2008), the largest randomised controlled trial of childhood anxiety treatment, found that 81% of children receiving combination CBT and sertraline were rated as much or very much improved at week 12, with CBT-alone close behind. Parent-completed measures consistently lagged clinician-rated measures — meaning parents could be sitting next to a child who was, by every clinician metric, responding well, and still feel that nothing was changing. The POTS team's parallel work in paediatric OCD (POTS, 2004) shows the same pattern: meaningful gains typically appear between sessions 4 and 8, but parents reading week-to-week often do not see them until weeks 10–14.
This is the finding that matters most for the question of whether ERP is working. Today's emotional weather is a poor instrument. It will fire whether the course is on the response trajectory or the genuinely-stuck trajectory, and it cannot reliably distinguish between them.
When parents ask "is this actually working?", they usually mean one of three things, and each has a different research-backed answer:
1. "Every exposure session ends with my child in tears — how is that progress?" 2. "It's been six weeks and the meltdowns are still here. The therapist says we're on track but I can't see it." 3. "I'm doing all the 'right' things, but also feel like I'm just pretending — am I doing/saying the right things for her?"
Parents on r/Anxiety and r/OCD describe this gap in almost identical language week after week — "how long did it take until you felt like therapy was actually working?" is itself one of the most upvoted questions in those communities. The phrasing is the symptom: the question is not whether the treatment is working but when it will start feeling like it is.
The literature offers four markers that meaningfully separate a responding course from a stalled one. None of them is "how does today feel."
A well-running ERP course shows two trends running in opposite directions: in-session distress staying high or even rising, while between-session avoidance slowly falls (Silverman et al., 2008; Foa & Kozak's emotional-processing framework underpins this). The child still cries during the exposure but more often makes it into the school car park. The bedtime ritual still happens but takes 22 minutes instead of 40. Parents who track only the loudness of the moment miss the slow decay of the avoidance pattern, which is the actual outcome the treatment targets.
Walkup et al. (2008) used global improvement ratings that weighted what the child can do — go to school, attend a birthday, sleep in their own bed — over how distressed they feel during it. Functional gains, not affective gains, are how the trial measured response. A child whose felt anxiety is unchanged but whose participation has expanded is, by the research definition, responding to treatment.
Repeated reassurance functions structurally as a compulsion (IOCDF). A working course shows the reassurance loop attenuating — the same question asked five times instead of fifteen, then once instead of five, then dropped entirely on some days. The child's tolerance for the uncertainty is the underlying gain. Parents tracking "how anxious did she seem today?" miss this; parents counting reassurance requests catch it within weeks.
Clinicians using manualised CBT or ERP have explicit response criteria and predefined points at which they would escalate (modify the hierarchy, add medication, reassess diagnosis). If your therapist is not escalating, that is meaningful information: their session-by-session view, calibrated against the trial literature, is that the course is on track. The single most useful question to ask in a session is not "is it working?" but "what would have to change for you to escalate?"
Stop measuring the treatment by how today's exposure felt. Measure it by what is different between this month and three months ago, on the four signals above. Specifically:
1. Pick three concrete markers today — average bedtime length, weekly count of avoidance wins, reassurance-question count per evening — and write them down with the date. 2. Re-check at the 90-day mark. POTS-style manualised treatment shows its first meaningful gains between sessions 4 and 8; expecting faster feedback is a misunderstanding of the mechanism. 3. Audit functional participation explicitly. What did she do this month that she could not have done three months ago? Parents who run this audit almost always discover gains they had not noticed. 4. Bring the markers to the therapist. A structured log is worth more than a narrative of how the week felt.
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Unseen Progress publishes long-form caregiver research and builds research-backed daily trackers for the families covered. See the full child anxiety research overview for the complete framework.