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Ayesha Bagus-Casker @Ayesha_bagus
Lorraine Steyn @lor_krs
Event Storming
Event Storming
Fear of asking “stupid” questions
Unconscious bias and assumptions
Not speaking the same language
Assuming that what you see is all there is
(psychological safety)
(make implicit -> explicit)
(domain terms, natural language)
We think we agree! Now we really get it!
The 3 rules
The right people in the room
Unlimited modelling space
Limited time (+-2 hours)
Events
Something that has happened (that matters).
Past Tense.
Hot Spots
Use this to park “problems”
Whenever we encounter:
 a question we cannot answer
 something that does not seem right
 or any problem we should look into
External Systems
Anything outside of the modeled domain.
Exercise
Organise events into a timeline
Start
Event
Timeline
…
Poké Bowl
Domain
We are introducing
Poké Bowls to our
city with our new online
ordering POKECO app
BUILD YOUR OWN BOWLS (BYOB)
Bowls start at Regular R50 / Maxi R70
STEP 1: CHOOSE YOUR BASE
Sticky Rice
Kale & Red Cabbage
Glass Noodles (+ 10)
Brown rice (+ 10)
Quinoa (+ 15 / 20)
STEP 2: PICK A PROTEIN
Tuna Sashimi (+ 45 / 59)
Salmon Sashimi (+ 55 / 69)
Prawn (+ 35 / 45)
Shredded Chicken (+ 20 / 25)
Tofu (+ 20 / 25)
STEP 3: TOP IT OFF (max 4)
Mango / Papaya Salsa
Orange
Pineapple
Cucumber
Sweet Red Onion
Carrot
Red Cabbage
Etc.
STEP 4: ADD CRUNCH (max 1)
Crunchy Noodles
Toasted Almond flakes
Toasted Macadamia nuts
Toasted Coco flakes
Shredded Nori (seaweed)
Crispy Wasabi Salmon Skin
STEP 5: DRESS IT (max 2)
House shoyu (soy - sesame oil) (v)
House ponzu (soy - citrus) (v)
Ginger ponzu (soy - ginger citrus)(v)
Hawaiian heat (soy - pineapple spice(v)
Creamy togorashi (sriracha mayo -soy)
Creamy wasabi (wasabi mayo - soy)
Miso tahini (miso sesame mayo - soy)
Gluten Free Tamari ( + 10) (v)
STEP 6: ADD EXTRA TOPPINGS
Avocado (+ 15 / 20)
Edamame (+ 10 / 20)
Tobiko Caviar, Seaweed Salad (+ 5 / 10)
Almond flakes (+ 10 / 15)
Macadamia nuts (+ 10 / 15)
Additional Sauce (+ 6)
Etc.
Online Ordering Domain Rules
1. Select size of bowl: Regular or Maximum
2. Select a base (required)
3. Select Ingredients from each section (optional)
4. Assume all ingredients are in stock
5. Collection in-store, or free delivery
6. Returning customers may choose to pay C.O.D.
7. New customers must pay online
Feedback
Command
Confirm
Order
A business process that results from an event.
Present Tense.
Actor
Role or user in the domain (persona)
Read Model
The information needed to make a Decision.
Policy
Business rules
Online Ordering Domain Rules
1. Select size of bowl: Regular or Maximum
2. Select a base (required)
3. Select Ingredients from each section (maximums)
4. Warn if client is missing anything they are entitled to
5. Some ingredients cost extra
6. Assume all ingredients are in stock
7. Collection in-store, or free delivery
8. Returning customers may choose to pay C.O.D.
9. New customers must pay online
Feedback
The models are a byproduct
of conversations, and it’s those
conversations that are the real value.
Kevin Webber
Alberto Brandolini @ziobrando
krs.co.za/training
Questions?
www.krs.co.za @lor_krs @ayesha_bagus

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Gathering Requirements Through Event Storming

  • 1. Ayesha Bagus-Casker @Ayesha_bagus Lorraine Steyn @lor_krs Event Storming
  • 3.
  • 4. Fear of asking “stupid” questions Unconscious bias and assumptions Not speaking the same language Assuming that what you see is all there is (psychological safety) (make implicit -> explicit) (domain terms, natural language) We think we agree! Now we really get it!
  • 5. The 3 rules The right people in the room Unlimited modelling space Limited time (+-2 hours)
  • 6. Events Something that has happened (that matters). Past Tense.
  • 7. Hot Spots Use this to park “problems” Whenever we encounter:  a question we cannot answer  something that does not seem right  or any problem we should look into
  • 8. External Systems Anything outside of the modeled domain.
  • 9. Exercise Organise events into a timeline Start Event Timeline …
  • 10. Poké Bowl Domain We are introducing Poké Bowls to our city with our new online ordering POKECO app
  • 11. BUILD YOUR OWN BOWLS (BYOB) Bowls start at Regular R50 / Maxi R70 STEP 1: CHOOSE YOUR BASE Sticky Rice Kale & Red Cabbage Glass Noodles (+ 10) Brown rice (+ 10) Quinoa (+ 15 / 20) STEP 2: PICK A PROTEIN Tuna Sashimi (+ 45 / 59) Salmon Sashimi (+ 55 / 69) Prawn (+ 35 / 45) Shredded Chicken (+ 20 / 25) Tofu (+ 20 / 25) STEP 3: TOP IT OFF (max 4) Mango / Papaya Salsa Orange Pineapple Cucumber Sweet Red Onion Carrot Red Cabbage Etc. STEP 4: ADD CRUNCH (max 1) Crunchy Noodles Toasted Almond flakes Toasted Macadamia nuts Toasted Coco flakes Shredded Nori (seaweed) Crispy Wasabi Salmon Skin STEP 5: DRESS IT (max 2) House shoyu (soy - sesame oil) (v) House ponzu (soy - citrus) (v) Ginger ponzu (soy - ginger citrus)(v) Hawaiian heat (soy - pineapple spice(v) Creamy togorashi (sriracha mayo -soy) Creamy wasabi (wasabi mayo - soy) Miso tahini (miso sesame mayo - soy) Gluten Free Tamari ( + 10) (v) STEP 6: ADD EXTRA TOPPINGS Avocado (+ 15 / 20) Edamame (+ 10 / 20) Tobiko Caviar, Seaweed Salad (+ 5 / 10) Almond flakes (+ 10 / 15) Macadamia nuts (+ 10 / 15) Additional Sauce (+ 6) Etc.
  • 12. Online Ordering Domain Rules 1. Select size of bowl: Regular or Maximum 2. Select a base (required) 3. Select Ingredients from each section (optional) 4. Assume all ingredients are in stock 5. Collection in-store, or free delivery 6. Returning customers may choose to pay C.O.D. 7. New customers must pay online
  • 14. Command Confirm Order A business process that results from an event. Present Tense.
  • 15. Actor Role or user in the domain (persona)
  • 16. Read Model The information needed to make a Decision.
  • 18. Online Ordering Domain Rules 1. Select size of bowl: Regular or Maximum 2. Select a base (required) 3. Select Ingredients from each section (maximums) 4. Warn if client is missing anything they are entitled to 5. Some ingredients cost extra 6. Assume all ingredients are in stock 7. Collection in-store, or free delivery 8. Returning customers may choose to pay C.O.D. 9. New customers must pay online
  • 20. The models are a byproduct of conversations, and it’s those conversations that are the real value. Kevin Webber