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The "Why" Behind the Drift

COM-B analysis of behavioural barriers for youth (13–16) and parents, mapped to well interactions. Shows where the behavioural system breaks down and why awareness-only interventions won't work.
Youth HCD · HPB × Zühlke
Youth: Y01–Y11 · Parents: P01–P10
Feb 2026
COM-B
Capability — Can they do it?
Opportunity — Does the environment support it?
Motivation — Do they want to (enough)?
Wells
Sleep Screen Eat Exercise Bond
⚡
The core tension isn't awareness — it's misalignment. Youth know what's healthy but lack execution strategies. Parents want to help but their tools stopped working. Both sides are trying — but the system around them has shifted faster than their strategies have adapted.
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Youth Barriers
n=11 · Y01–Y11
C
Capability
Self-regulation under pressure
Phone feels addictive and hard to control
ScrnSleepBond
Y03, Y05
→ Build self-regulation skills; concrete strategies for breaking cycle
Habits regress during school term due to fatigue
SleepScrnEatExer
Y01, Y03, Y04, Y08, Y09, Y10
→ Teach "minimum viable habits" for busy periods
Food choices default to unhealthy when unsupervised
Eat
Y01, Y03, Y05, Y06, Y10
→ Build independent decision-making skills; practice scenarios
O
Opportunity
Environment enables unhealthy defaults
Phone in bedroom — no barrier to use at night
ScrnSleep
Y03, Y04, Y06, Y09, Y10
→ Environment redesign — charging outside bedroom
Parental monitoring feels controlling → triggers resistance
ScrnBond
Y01, Y03
→ Shift from control to collaboration; co-create agreements
Doesn't turn to parents when stressed
Bond
Y01, Y06, Y08, Y09, Y11
→ Build alternative channels (siblings, peers); reduce "last resort"
M
Motivation
Health not tied to identity or immediate goals
Phone before bed serves emotional function — required to fall asleep
ScrnSleep
Y03, Y06, Y09
→ Replace the function, not just remove the phone
Low motivation for exercise — feels like chore, not choice
Exer
Y01, Y05
→ Connect exercise to what they care about (appearance, energy, social)
Academics always win the trade-off against health
SleepExerBond
Y04, Y10, Y11
→ Reframe: health enables academic performance, not competes
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Parent Barriers
n=10 · P01–P10
C
Capability
Strategy gap — old tools don't work
Strategies that worked in primary school no longer work
ScrnEat
P03, P06
→ Equip with developmentally-appropriate strategies for teens
Children find ways to circumvent screen time controls
Scrn
P03, P07, P10
→ Shift from tech controls to relationship-based agreements
Don't know how to rebuild connection as child pulls away
Bond
P04, P06, P07
→ Teach new connection approaches for teens
O
Opportunity
Visibility gap — reduced access to child's daily life
Secondary school reduced visibility into daily routine
BondScrnEat
P05, P06, P10
→ Accept reduced visibility; build trust-based alternatives
Screen-sleep cycle: phone at night disrupts sleep and mood
ScrnSleep
P01, P03, P06, P07, P10
→ Environment redesign — charging outside bedroom
Evening eating defaults to unhealthy when parent not present
Eat
P06, P10
→ Prepare environment; stock healthy defaults
M
Motivation
Confidence gap — feels too late or futile
Defaults to restriction framing: "screen = bad, take it away"
ScrnSleep
P01, P03, P06
→ Reframe from "restrict screen" to "support sleep"
Feels outsmarted by tech-savvy child → questions whether effort is worth it
Scrn
P07, P10
→ Reframe success: relationship over compliance
Uncertain whether to push or pull back — sense of "losing battle"
BondScrnEat
P03, P04, P06, P07
→ Build confidence; provide quick wins; show it's not too late
Where Youth + Parent Barriers Converge

Capability Convergence

Youth
Were handed the "what" — no one taught the "how" of self-regulation
↕ mirrors ↕
Parent
Primary school strategies expired — no replacement toolkit for teens

Opportunity Convergence

Youth
Between 3pm and bedtime, structures that made healthy easy are gone
↕ mirrors ↕
Parent
Reduced visibility into daily routine — can't see what's happening

Motivation Convergence

Youth
Phone serves emotional function — removing it removes coping, not just distraction
↕ mirrors ↕
Parent
Defaults to restriction because no alternative framework exists
Key Well Interaction Chains (cross-cutting patterns)
Screen → displaces → Sleep → disrupts → Eat → fatigue suppresses → Exercise The dominant cascade — appears in 8/11 youth, 5/10 parents
Bond → weakens → Parental Influence → removes last check on → Sleep Sleep has no driver once parents withdraw — the handover gap
Screen → emotional regulation → Bond → replaces → Parent as coping resource Phone becomes the substitute support system