CBASP vs IPT
A side-by-side comparison: mechanism, evidence, the conditions each treats, philosophical roots, and where they actually disagree clinically.
At a glance
CBASP
- Tradition
- Integrative
- Founder
- James McCullough (2000)
- Evidence
- Guideline-recommended
- Focus
- Interpersonal + Cognitive
- Format
- Individual
- Duration
- Medium (16-24)
IPT
- Tradition
- Integrative
- Founder
- Klerman / Weissman (1984)
- Evidence
- Guideline-recommended
- Focus
- Relational + Skill
- Format
- Individual
- Duration
- Short (12-16)
How they work
CBASP
Core mechanism: Situational analysis teaches cause-and-effect thinking about interpersonal encounters; interpersonal discrimination exercise separates therapist from maltreating early figures; disciplined personal involvement provides corrective experience
Ontology: Chronic depression involves developmental arrest at a pre-operational cognitive level (Piaget) due to early maltreatment — the person cannot perceive how their behavior affects others
IPT
Core mechanism: Improving interpersonal functioning in one of four problem areas (grief, disputes, transitions, deficits) alleviates depression
Ontology: Depression occurs in an interpersonal context; improving relationships and social roles improves mood
Conditions treated
1 shared · 0 CBASP-only · 3 IPT-only
Both treat
Only IPT
What each assumes — and misses
CBASP
Philosophical roots: Piaget (pre-operational thought — central to the model); Bowlby (early maltreatment shapes interpersonal schema); Sullivan (interpersonal theory); Bandura (social learning); Seligman (learned helplessness — which McCullough challenged)
Blind spots: Narrow application (chronic depression only); pre-operational framing may pathologize; disciplined personal involvement requires high therapist skill; limited replication outside McCullough's group
Therapeutic voice: What did you want from that interaction? What did you actually do? Did your behavior get you what you wanted?
IPT
Philosophical roots: Sullivan (interpersonal psychiatry — personality is the pattern of interpersonal situations); Meyer (psychobiology); Durkheim (social integration and anomie); Bowlby (attachment/loss)
Blind spots: Focused scope (4 problem areas) may miss broader personality patterns; less suited for complex or chronic presentations
Therapeutic voice: It sounds like this grief hasn't had a place to go since your mother died. Let's make room for it here.
Choosing between them
CBASP and IPT both sit within the Integrative tradition — they share a worldview about what suffering is and how change happens. Differences are more often about technique and emphasis than about underlying theory.
For deeper coverage: see the full CBASP and IPT pages, or use the interactive comparison tool to add more modalities to this comparison.