Short, working definitions of the terms used in this guide,
written for product and engineering leaders rather than
growth marketers.
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Activation
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The moment a new user first experiences the product’s
core value. The single most important milestone in
SaaS onboarding, and the event the entire signup
flow should be designed around.
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Time to Value (TTV)
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How long it takes a new user to reach activation.
The metric that onboarding design exists to shorten.
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Aha Moment
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The informal name for the instant a user understands,
viscerally, why the product is worth paying for.
Activation is the measurable proxy for it.
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Product-Led Growth (PLG)
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A go-to-market model where the product itself acquires,
converts, and expands customers through self-serve
experience rather than a sales team. Puts maximum
weight on interface quality.
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Sales-Led Growth
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The model where human sales drives acquisition and
the product’s design weight shifts toward evaluation
surfaces, admin experience, and making the sold
promise true in daily use.
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Freemium
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A permanently free tier alongside paid plans,
keeping future customers inside the product until
their needs grow into a purchase.
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Trial-to-Paid Conversion
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The share of trial accounts that become paying
customers. Driven far more by whether users reached
activation than by trial length or prompt volume.
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Feature Gating
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Restricting specific capabilities by plan.
Best practiced visibly, so locked features teach
the plan structure in context rather than hiding it.
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Paywall
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The interface moment where a user meets a plan limit
or locked capability. A designed surface that either
builds the upgrade case or erodes trust, one encounter
at a time.
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Usage-Based Pricing
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Pricing metered by consumption rather than seats.
Obligates the interface to make current usage,
remaining allowance, and reset dates
continuously legible.
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Churn
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The rate at which customers cancel or fail to renew.
The number every retention-focused design decision
in this guide ultimately serves.
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Involuntary Churn
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Cancellations caused by payment failure rather than
decision, typically expired cards. Recoverable largely
through well-designed dunning and payment-update flows.
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Expansion Revenue
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Additional revenue from existing customers through
upgrades, added seats, and increased usage.
The commercial payoff of adoption design.
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Shelfware
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Software that is purchased but not used. The fate
of SaaS products that win the sale and lose the
daily user, and a cancellation with a delay on it.
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Empty State
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Any screen with no data to show yet. In SaaS these
cluster at the start of the customer relationship,
which makes them onboarding surfaces rather than
edge cases.
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Skeleton Screen
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A loading state that sketches the incoming layout
in placeholder shapes. Reads as faster and calmer
than a spinner because it promises structure.
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Progressive Disclosure
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Showing the essential first and revealing depth on
demand. The core technique for keeping feature-rich
products approachable without removing capability.
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Command Palette
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A keyboard-invoked search-and-action interface that
lets power users jump anywhere and invoke anything.
A pressure valve for navigation, never a substitute
for architecture.
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In-App Messaging
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Announcements, tours, and prompts delivered inside
the product. Effective in proportion to how
contextually and sparingly it is spent.
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Design System
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The shared library of components, patterns, states,
and rules, plus the governance around it, that keeps
a continuously shipping product coherent.
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Design Tokens
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The named foundational values, color, type, spacing,
elevation, that a design system builds on, enabling
theming, density modes, and dark mode as
systematic capabilities.
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Multi-Tenancy
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One product serving many customer organizations
with isolated data. Creates the design obligation
to keep the user’s current organizational context
unmistakable.
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RBAC (Role-Based Access Control)
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Governing what users can see and do through assigned
roles. Succeeds or fails on whether administrators
can predict what a role actually grants.
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SSO (Single Sign-On)
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Authentication through a customer’s central identity
provider. A standard enterprise requirement whose
setup experience shapes IT’s first impression
of the product.
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SCIM
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The provisioning standard that syncs users and
groups from a customer’s directory automatically.
Turns user management from a manual chore into
a configured flow.
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Audit Log
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The reviewable record of who did what, when,
in an account. A governance requirement for
enterprise buyers and an admin trust surface.
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VPAT
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The standard document format for reporting a
product’s accessibility conformance, routinely
requested in enterprise and public-sector procurement.
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WCAG
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The Web Content Accessibility Guidelines, the
standard referenced by regulators, courts, and
procurement teams as the practical baseline
for digital accessibility.
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Dark Pattern
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An interface design that manipulates users into
actions serving the business at their expense,
hidden exits, pre-checked options, pressure tactics.
In a subscription model, a direct withdrawal from
the trust renewals run on.