Stop 12 · Communication & Data StorytellingTopics · 7/8

Slide Design for Data Presentations

In short

A cluttered slide makes people read instead of listen. A clean slide with one clear chart makes your point before you've said a word.

One key message per slide, minimal text, and a chart designed to make that message obvious at a glance — most data presentations fail by cramming too much onto each slide.

The jaadu neatly places a few colourful sweets on a tray inside a glass display counter.

Think of it like this

The mithai shop display

A good mithai shop doesn't pile every sweet into the window. It shows a few neat rows, with the special kaju katli placed front and centre under the light. Your slide should do the same: few things, one star.

Watch it happen

Decluttering one chart slide

3D bars

Gridlines

Legend

8 colours

Title: Sales

Bars

1/5A typical first draft. Everything is switched on, and nothing stands out.

The big ideas

What you need to know

One message per slide

If a slide needs two takeaways, split it into two slides.

Title states the point

"Pune sales fell 30% in Sept" beats "Sales by City". The audience gets it even if they zone out.

Grey plus one colour

Make everything grey and highlight only what matters. Colour should point, not decorate.

Cut the chart junk

Drop 3D, shadows, heavy borders and unneeded decimals. Every mark on the slide should earn its place.

See it in code

Walk through the code

python

1import matplotlib.pyplot as plt2 3cities = ["Mumbai", "Delhi", "Pune", "Jaipur"]4change = [4, 2, -30, 1]5colors = ["#b0b0b0"] * 46colors[2] = "#7c3aed"  # highlight Pune7 8fig, ax = plt.subplots(figsize=(6, 3))9ax.bar(cities, change, color=colors)10ax.set_title("Pune sales fell 30% in September", loc="left")11ax.spines[["top", "right"]].set_visible(False)12plt.show()

1/3All bars start grey, then only Pune gets the strong colour.

A decluttered bar chart: grey bars, one highlight, a title that states the point and no extra borders.

Save yourself the pain

Common mistakes

Oops

Pasting a dense table and saying "as you can see".

Do this instead

Turn the table into one chart with the key value highlighted, and move the table to the appendix.

Oops

Using a different colour for every bar because it looks lively.

Do this instead

Use grey for context and one strong colour for the bar you're talking about.

Your mission

Redesign one ugly chart

~25 min

Quick check

Which slide title is best for a chart showing monthly signups?

Go deeper

1Rebuild a cluttered slide down to a single chart and a single headline takeaway.
2Practice writing the slide title as the conclusion, not just the chart's subject.
3Learn the 'assertion-evidence' slide structure used in strong technical presentations.