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Conversational Design #1: Designing Conversational Interactions

Hello and welcome! Here at Master of Code, we’ve decided to share our approach to conversational design in this series of articles. Please enjoy and let us know your thoughts!

This is part 1 on the planning of a conversational experience. We’ll take a deep dive into the theory behind some of our best practices, then in part 2 we’ll look at techniques for structuring a conversational design diagram.

The objective of building a conversational interface is the same as any other UI you might implement: to help your users accomplish their tasks easily and efficiently. Whether a searchable FAQ or pictures of retail goods, a UI lets users interact with your data to reach a successful outcome. Conversational AI is unique in doing so with a more personable, human-like touch — but it still needs to be efficient to be successful.

So let’s take a look at how to design a conversation while preventing it from getting side-tracked by unexpected situations!

Keep Moving Forward

One of the most important concepts in conversational design is to always (kindly) push the user on to the next step of their journey. Remember, they are interacting with the system to accomplish a task and reach a successful outcome, but they may not know how to get there on their own.

Nothing about the greeting on the right guides the user to their next step. In fact, dead air is so disastrous to a successful interaction that in one of the most demanding forms of real-time conversation of all — the world of improv comedy — there is a whole theory around managing such moments, called Blocking.

Key idea: Don’t block your users, always step forward. End each of your bot’s turns with a question, prompt or other Call to Action.

Focus the User’s Response

If you review the screenshot in the previous section, you may notice that even the greeting on the left opens the bot up to some unexpected responses. While we provided menu buttons, the greeting itself was quite open-ended — some users may miss the buttons on the left and type a response to the question which was asked: “How can I help you today?”

This question invites a wide range of responses, many of which are likely outside the scope of your bot. To reduce the amount of unexpected input that users send your bot, focus the range of responses they can easily give. Consider the difference between these two dialogues:

In the example on the right, we’re asking the user such an open-ended question that they are certain to reply in ways the system wasn’t built to handle. In the example on the left, we constrain their options — of course, they may still type something unexpected, but at least we’ve increased the chances they reply with one of the options presented (even if they type it instead of pressing a button.)

This technique is actually the positive realization of a well-documented fallacy called the false dilemma. Happily, in conversational design we’re able to apply it for the good of the user, to help them achieve their goal.

Key idea: Focus the range of inputs a user is likely to give to promote responses your bot is designed to handle.

Circular Approach

Suppose we’re designing a bot for a shoe store — consider these scenarios which deviate from the basic flow or happy path:

  1. User realizes they accidentally clicked on “loafers” instead of “sneakers”.
  2. User copy & pastes into the chat an image of the sneaker they want to buy.
  3. User says “actually I think I liked that other one you showed me” but the bot is unable to communicate with its NLU process to determine the intent of this utterance.

Are these all the same type of error? Do they each impact bot design in the same way?

No, the first scenario is different from the others, and recognizing the difference helps design a more effective flow:

  • In scenario #1, the user gave valid inputs and the system is functioning correctly, but they want to make a change. Proactively giving the user options to address this situation is a good practice we’ll discuss below.
  • Scenario #2 is a technical limitation as the bot isn’t able to interpret the image.
  • #3 is a system failure.

Accommodate Text-Only Inputs

One type of unexpected input can be converted into expected input during the design phase: be ready for users to type the text-label of buttons and other controls, rather than using the control itself.

For example, if you provide a button labelled “Continue”, then you need to ensure that wherever this button is shown, the system is also ready for the user to type the word “Continue”. Otherwise, when this unexpected utterance is sent to your NLU process, it likely won’t be able to determine the user’s intent or separate it from other occurrences of the same word throughout your system.

Key idea: Always be ready for the user to type the name (or other characteristic) of buttons, graphics and controls, rather than using the control itself.

Designing for Success!

This article presented 4 of MOC’s best practices for designing conversational flow. These are lessons drawn from our own experience delivering successful solutions and using them will positively impact the design of other chatbots too:

  1. End each of your bot’s turns with a question, prompt or other Call to Action.
  2. Focus the range of inputs a user is likely to give, to promote responses your bot is designed to handle.
  3. Use a circular approach to give the user the option to back up a step and change their path or give a different response.
  4. Accommodate text-only input even when you’ve provided buttons, graphics and other controls.

Parts 2 and 3 of this topic put these key ideas into practice, diagramming-out the conversational flow and sharing more of our best practices for doing so!

We’d love to help you with your conversational systems development. Schedule a free consultation with our Conversational AI Solution Experts today.


Originally published at on May 27, 2020.



We partner with world’s leading companies to design and develop conversational experiences across mobile, web and chatbots. Let us help you connect your brand with customers where they communicate today. Chat or voice.

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