Chapter 1

1. Intents, slots, and utterances
2. Any two from:
   • They are both Amazon services
   • They are both chatbots
   • They both use Natural Language Understanding/NLU/NLP
3. Any two from:
   • Alexa uses voice interaction, whereas Lex can be voice- or text-triggered
   • Alexa uses skills, whereas Lex can be applied to lots of applications
   • Lex can be triggered by other services, whereas Alexa only works on Alexa devices
4. You should start with a perfect conversation and build from there
5. Tone of voice is about the words and phrases that your chatbot uses and making sure that it suits the user
6. Missed utterances, external API errors, and errors in your code