Building Dashboards & Reports — Power BI, Tableau & KPIs

Building Dashboards & Reports: Power BI, Tableau and KPIs

2 min readPublished 29 Jul 2026

Dashboards turn data into an always-on decision tool. Being able to build a clear, trustworthy dashboard in Power BI or Tableau is one of the most employable data skills today.

Report vs dashboard

A report is detailed, often static, and answers specific questions (a monthly sales report).
A dashboard is a curated, at-a-glance view of the most important metrics, usually interactive and refreshed automatically. Both matter; know which the stakeholder actually needs.

Choosing the right KPIs

A dashboard is only as good as its metrics. Good KPIs are:

Tied to an objective — they answer "are we succeeding?", not "what can we count?".
Balanced — don't optimise one metric at the expense of another.
Actionable — a change in the number should prompt a decision.
Comparable — shown against a target, prior period or benchmark, so a number has meaning. Avoid vanity metrics that look good but drive nothing.

Power BI vs Tableau

Both are excellent, drag-and-drop BI tools that connect to data, model it and visualise it interactively:

Power BI — deeply integrated with Microsoft/Excel, cost-effective, dominant in UK/European job ads; uses DAX for calculations and Power Query for prep.
Tableau — best-in-class for exploratory visualisation and polish; strong where organisations have standardised on it. Learn the one your target employers use.

Data modelling basics

Real dashboards combine tables. A simple star schema — a central fact table (transactions) linked to dimension tables (date, product, customer) — keeps dashboards fast and calculations correct. Understanding relationships and a basic calculated measure (e.g. a SUM or % of total) takes you a long way.

Dashboard design best practice

Most important metric top-left (where eyes land first).
Consistent layout, colours and formatting.
Interactive filters/slicers so users answer their own questions.
Fast and refreshable — automate the data update.
Apply the visualisation principles: right charts, no junk, honest axes, takeaway titles.

Put it to work

Rebuild a spreadsheet report as an interactive dashboard, choose 4–6 real KPIs with comparisons, then practise identifying trends in the Executive Dashboard lab.

Interview Intelligence

How this topic actually shows up in interviews — and how to demonstrate you understand it.

Why employers ask about this

Dashboard-building in Power BI/Tableau is one of the most common requirements in BI and analyst roles.

Technical questions

How do you decide what to put on a dashboard?+

Start from the decisions/objectives, choose balanced actionable KPIs with comparisons, and cut vanity metrics.

What is a star schema and why use it?+

A central fact table linked to dimension tables — it keeps dashboards fast and calculations correct.

Behavioural questions

Tell me about a dashboard or report you built and who used it.+

Use STAR: the audience and decisions, the KPIs and tool you chose, the design, and how it was actually used.

Real-world scenarios

“A manager asks for a dashboard with 30 metrics 'so nothing is missed'.”+

Expected answer: Push back: identify the few decisions it must support, choose 4-8 actionable KPIs with comparisons, and move detail to a drill-down.

Practise in AI Interview™Rehearse these questions, scored.Plan with Career Coach™A personalised path to your goal.Evidence it in Career Passport™Prove this skill to employers.

Employability Intelligence

Where this knowledge takes you — the jobs, skills and certifications it feeds into.

Relevant roles

BI AnalystData AnalystReporting Analyst

Skills you're proving

Power BITableauKPI designData modellingDashboard design

Recommended certifications

Microsoft Power BI (PL-300)Google Data Analytics

Career progression

Core to BI Analyst, Data Analyst and Reporting careers.

What employers expect

That you can clean, analyse and visualise real data, write SQL, and turn findings into clear, actionable recommendations for the business.

Frequently asked questions

What is the difference between a report and a dashboard?

A report is detailed and often static; a dashboard is a curated, interactive, auto-refreshed at-a-glance view of the most important metrics.

What makes a good KPI?

It's tied to an objective, balanced, actionable and shown against a target or prior period so the number has meaning — not a vanity metric.

Should I learn Power BI or Tableau?

Both are strong; learn the one your target employers use. Power BI dominates Microsoft/UK job ads; Tableau leads in many others.

Practise what you've learned

Turn this guide into real, evidenced progress

Missiora helps you measure, improve and evidence the capabilities employers actually value — start with the tools best suited to this topic.

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Missiora

Missiora is an AI Employability Intelligence platform. Our resources are researched and reviewed by the Missiora team to help you measure, improve and prove your career readiness.