Program Design · Research Foundation
TPP’s program structure — the recorded call cycle, the 9–12 month length, the front-loaded wraparound support, the deliberate inclusion of fathers — was not assembled from instinct. This page traces the exact line from each study’s findings to the specific program decisions they produced.
Most programs cite research after the fact, in grant applications, as a layer of credibility over decisions that were already made. TPP was built the other way around: the program structure emerged from the research, not the other way around.
This page documents the chain of reasoning — study finding to program design decision — in transparent, specific terms. It is meant for parents who want to know why the program is structured the way it is, for funders who need to evaluate the evidence base, and for professionals who want to understand what distinguishes TPP from generic co-parenting resources.
Six core program decisions came directly out of the research. Each one is traced below.
Research by Craigie (2008) and Carlson et al. (2008) shows that how parents interact matters far more than which household a child lives in. This finding is the foundation of TPP's entire model.
Allen & Daly (2007) synthesized 150 studies demonstrating that father involvement produces measurable improvements in children across every outcome category. TPP's design treats paternal participation as non-negotiable.
Financial stress, food insecurity, and workforce instability are identified across the research base as structural stressors that escalate co-parent conflict. TPP addresses them directly, in Month 1, not as afterthoughts.
McCormick's analysis of child support enforcement history and the CRS legislative record both demonstrate that court-based systems were never designed to improve parenting relationships — only to enforce financial obligations.
Fragile Families research (2014) tracked co-parenting trajectories over time and found distinct patterns — including improving and recovering trajectories — suggesting that structured intervention at the right time can shift outcomes.
Behavioral skill development in high-conflict contexts requires sustained, structured practice over time. The 9–12 month program length reflects this reality, not arbitrary program design.
Understanding the policy history behind child support enforcement explains why TPP exists as an alternative, not a supplement, to the legal system. Two foundational documents establish this context.
The CRS report traces the federal Child Support Enforcement (CSE/IV-D) program from its origins in 1975 through more than 50 years of legislative amendments. The program began as a welfare cost-recovery mechanism — designed to recoup public expenditure, not to support family stability. Through the 1980s and 1990s, its scope expanded to serve both welfare and non-welfare families, with increasing enforcement authority and distribution rule changes. By 2023, the CSE program represented a multi-decade accumulation of enforcement-focused policy that was never restructured around family wellbeing.
McCormick's critical narrative of child support enforcement traces how the system grew into a multi-billion-dollar bureaucracy with institutional incentives that systematically marginalized fathers. The "man out of the house" rule in early welfare policy created structural disincentives for father presence that persisted for decades. The analysis provides historical grounding for understanding why fathers are often disengaged from their children — not because of individual failure, but because the system was designed in ways that discouraged their involvement.
The landscape of post-separation family life has changed dramatically over the past 60 years. Three data sources document this shift and establish the population TPP was designed to serve.
Using Wisconsin court records spanning 1988 to 2008, this study documents one of the most significant structural shifts in post-divorce family life: mother-sole custody arrangements fell sharply, while shared physical custody arrangements rose dramatically. Father-sole custody remained largely stable throughout the period. The shift reflects changing social norms and evolving custody adjudication processes — not changes in family demographics or child outcomes. The implication is that an increasing proportion of separated families are now navigating the operational complexity of two-household shared parenting.
One in four parents living with their children today are unmarried. The composition of that group has shifted significantly since 1968: solo mothers dropped from 88% of unmarried parents in 1968 to 53% in 2017, while cohabiting parents rose to 35% of the unmarried parent population. Solo fathers have remained steady at approximately 12%. These figures establish that the families TPP serves are increasingly diverse in structure — and that unmarried, never-married, and previously cohabiting parents represent a substantial and growing share of the co-parenting population.
Two studies establish the research basis for TPP's approach to paternal engagement — and challenge the common assumption that household composition is what matters most for children.
This landmark synthesis reviewed more than 150 peer-reviewed studies on father involvement and child outcomes. The evidence across cognitive, emotional, social, and physical outcome categories was consistent: active, involved fathers produce better outcomes on virtually every measure examined. The benefits were documented across both married and unmarried family structures, across income levels, and across racial and ethnic groups. The synthesis also found that the co-parenting relationship — specifically, the quality of communication and coordination between parents — was a key mediator of how much father involvement a child actually experienced over time.
Craigie's study produced a finding that challenges the conventional focus on household composition as the primary predictor of child outcomes: family stability matters more than family structure. A stable single-parent household produced better child cognitive outcomes than an unstable two-parent household with intermittent, conflict-laden father presence. The critical variable was not which adults were in the house — it was whether the household environment was consistent, predictable, and low-conflict. This finding shifts the intervention target from custody structure to the stability of the co-parenting relationship itself.
Three studies from the Fragile Families research program and related work establish two crucial findings: communication quality drives outcomes, and co-parenting trajectories can improve. Both findings directly justify TPP's intervention model.
Using Fragile Families data, Carlson and colleagues examined the relationship between co-parenting quality and nonresident father involvement. The key finding: positive co-parenting quality predicted greater future father involvement, but father involvement only weakly predicted future co-parenting quality. The causal direction matters — it suggests that improving the co-parenting relationship is the more powerful lever for increasing paternal engagement. Communication between parents was identified as the central mechanism through which co-parenting quality either supported or undermined continued father involvement.
This Fragile Families study tracked co-parenting trajectories over time following parental separation and identified four distinct patterns: consistently high co-parenting quality, consistently low quality, declining quality over time, and improving quality over time. The existence of an improving trajectory — documented in a subset of families — is directly relevant to intervention design: it demonstrates that co-parenting quality is not fixed at the point of separation. Predictors of trajectory type included maternal health, race, relationship quality at the time of the child's birth, and repartnering by either parent. The finding that co-parenting is dynamic justifies structured intervention programs designed to shift trajectory.
A transparent map of every study and the specific program elements it informs.
| Study | Key Finding | Program Elements Informed |
|---|---|---|
| CRS · 2023 | CSE program built for welfare cost recovery, not family support — 50+ years of enforcement-first policy | Court-Free DesignFinancial Coaching Framing |
| McCormick · ACFC | Systemic incentives structurally marginalized fathers; the "man out of the house" rule produced lasting disengagement | Father Inclusion PriorityTwo-Parent Enrollment Model |
| Cancian et al. · 2014 | Shared custody rose dramatically 1988–2008; sole maternal custody declined sharply; two-household life is now the norm | Two-Household Budget FrameworkTwo-Household Meal PlanningProgram Scope & Eligibility |
| Pew Research · 2018 | 1 in 4 parents are unmarried; never-married and cohabiting parents are a major and growing share of the co-parent population | Broad Eligibility (No Marriage Required)Wraparound Referral Priority |
| Allen & Daly · 2007 | Father involvement improves child outcomes across all categories; co-parenting relationship mediates the degree of involvement | Father Inclusion as Program GoalCounselor's Paternal Engagement Role |
| Craigie · 2008 | Family stability predicts child cognitive outcomes more than family structure; stable single-parent outperforms unstable two-parent | 9–12 Month Program LengthStability as North Star (Not Custody) |
| Carlson et al. · 2008 | Co-parenting quality → father involvement (strong); father involvement → co-parenting quality (weak); communication is the mechanism | Recorded Call Cycle as Core InterventionCounselor Feedback Loop Design |
| Fragile Families · 2014 | Four distinct co-parenting trajectories; improving trajectory exists; quality is dynamic, not fixed at separation | Variable Program Length (9/10/11/12 mo)Assessment-Determined Program Tier |
| Census CH-1 · 1960–Present | Long-term rise in single-parent households; documented across 60+ years of national data | Partner Referral InfrastructureFinancial Coach Priority in Month 1 |
The research doesn't just inform individual program elements — it produces a coherent theory of change that connects the intervention to the outcomes families experience.
The central variable. Research shows it mediates father involvement, child stability, and household function. It is the lever the program pulls.
The intervention mechanism. Twice-monthly recorded calls, followed by professional review and structured feedback, build communication skill over time.
Financial coaching, nutrition support, and workforce referrals remove the structural stressors that make communication improvement impossible to sustain.
Trajectory change requires time. The program length is calibrated to each family's volatility — not to an administrative default.
The outcome. Both parents maintain meaningful access to their child. Children experience a stable, lower-conflict co-parenting environment. Courts are not needed.
Carlson et al. (2008) established that co-parenting communication quality is the primary driver of father involvement — not the reverse. Allen & Daly (2007) showed that father involvement drives child outcomes across every measured category. Craigie (2008) showed that stability — which communication quality enables — predicts child cognitive outcomes more powerfully than household structure.
The chain: communication quality → father involvement → child outcomes. TPP intervenes at the first link in that chain.
Financial stress, food insecurity, housing instability, and workforce challenges are documented across the research base — Pew (2018), Census CH-1, and the Fragile Families studies — as structural conditions that correlate with co-parenting conflict. Parents cannot learn to communicate differently while drowning in structural stressors.
TPP's front-loaded wraparound support — financial coaching in Month 1, nutrition in Month 1, workforce referrals in Month 1 — is designed to stabilize the environment before expecting behavioral change.
Put the Research to Work
Every element of TPP’s program was shaped by what the research says actually works for separated families and the children caught between them. If you’re ready to see what that looks like in practice, the next step is the assessment.
