Sample size

Calculate how many users you need in experiments to detect meaningful differences and avoid declaring winners prematurely based on insufficient data.

Sample size

Sample size

definition

Introduction

Why it matters

How to apply it

Keep learning

Growth orchestration

Get a grip on what's actually working and what needs course correction. Use data and experiments to make decisions instead of opinions. See how changes in one part of the system affect everything else. Random tactics don't compound, coordinated ones do.

Explore playbooks

Tool selection

Tool selection

Select tools across your growth stack using clear evaluation criteria. Avoid common pitfalls, ensure integrations work, and build a system that scales with your business.

Customer research

Customer research

Uncover specific pain points, validate assumptions, and reveal what actually drives buying decisions. Run research that produces actionable insights, not just interesting quotes.

Quarterly strategy

Quarterly strategy

Run quarterly business reviews that assess current state, set ambitious but realistic goals, build actionable roadmaps, and define key results that keep everyone aligned.

Monthly review

Monthly review

Analyse monthly performance data across all four growth engines. Identify what is working, what is not, and make tactical adjustments using a structured decision framework.

Related books

No items found.

Related chapters

4

Document learnings and update operations

Don't just declare winners and move on. Extract the pattern, document why it worked, update playbooks and templates, and build an experimentation culture where testing is continuous.

Wiki

Deep Work

Block extended time for cognitively demanding tasks requiring sustained focus, maximising valuable output whilst minimising shallow distractions.

Control group

Maintain an unchanged version in experiments to isolate the impact of your changes and prove causation rather than correlation with external factors.

Braindump

Clear mental clutter by transferring all thoughts, tasks, and ideas onto paper or screen, creating space for focused work.

Hypothesis testing

Structure experiments around clear predictions to focus efforts on learning rather than random changes and make results easier to interpret afterward.

Referral marketing

Turn satisfied customers into active promoters who systematically bring qualified prospects into your pipeline at near-zero acquisition cost.

Sample size

Calculate how many users you need in experiments to detect meaningful differences and avoid declaring winners prematurely based on insufficient data.

Inbound Marketing

Attract prospects through valuable content that solves real problems, building trust and generating qualified leads who approach you.

Churn rate

Measure the percentage of customers who stop paying to identify retention problems and calculate the true cost of growth in subscription businesses.

Key Performance Indicator (KPI)

Select metrics that reveal whether you're achieving strategic goals to track progress and identify problems before they become expensive to fix.

UTMs

Track campaign performance precisely by appending parameters to URLs that identify traffic sources, mediums, and campaigns in your analytics.

Statistical significance

Determine whether experiment results reflect real differences or random chance to avoid making expensive decisions based on noise instead of signal.

Annual Recurring Revenue (ARR)

Track predictable yearly revenue from subscriptions to measure business scale and growth trajectory in B2B SaaS and recurring revenue models.

API

Enable tools to exchange data programmatically so you can build custom integrations and automate processes that vendor-built integrations don't support.

Activity tracking

Log emails, calls, and meetings automatically to understand what drives deals forward and coach reps based on actual behaviour rather than guesswork.

Customer Acquisition Cost (CAC)

Calculate the total cost of winning a new customer to evaluate marketing efficiency and ensure sustainable unit economics across all channels.

Pareto Principle

Focus effort on the 20% of activities that drive 80% of results, systematically eliminating low-yield work to maximise output per hour invested.

Prioritisation

Systematically rank projects and opportunities using objective frameworks, ensuring scarce resources flow to highest-impact work.

Constraint

Identify and leverage limitations as forcing functions that drive creative problem-solving and strategic focus.

Standard Operating Procedure (SOP)

Document your repeatable processes in clear, step-by-step instructions that ensure consistency, enable delegation, and capture institutional knowledge.

Compound growth rate

Calculate your true growth trajectory by measuring the rate at which your business grows when gains build on previous gains over multiple periods.