Identifying Spec-Gen Structures

Kind of Stores

A store of a kind of sales outlet.
Connie might expand to other sales outlets so for now, leave the store as it is.

Kind of Sales

• Sales, return
• Only difference is that these might be positive or negative.

Prices

• Regular price
• Promotional sales price

Payment

• Cash
• Check
• Charge
  

Identifying Whole-part Structures

• A store as a whole is made up of cashiers, registers and items
• A register contains a cash drawer
• A sale is constituted of sale line items
  

Establishing Responsibilities

Who I Know - Rules of Thumb

• an actors knows about its participant.
  • person knows about cashier
• a transaction knows about its participant.
  • a session knows about its register and cashier
• a transaction contains its transaction line items
  • sale contains its sale line items
• a transaction knows about its sub transactions
  • session knows about its sales
  • sale knows about its payments
• a place knows about its transactions
  • store knows about its sessions
• a place knows about its descriptive objects
  • store knows about its tax categories
• a container knows about its contents
  • store knows about its cashiers, items, registers

Define Attributes, Services and Links - what I Know, what I Do, Who I Know

Actors

person

Attributes

• name
• address
• phone

Services

Participants

cashier

Attributes

• number
• password
• authorization level
• current session

Services

• isAuthorized
• assess
• Performance

Places

store

Attributes

• name

Services

• get item for UPC
• get cashier for number

Tangible Things

• item

Attributes

• number
• description
• UPCs
• prices
• taxable
• attributes with repeating names - create new objects
  • UPC
  • Price (specialization - promotional price)

Services

• get price for a date
• how much for quantity

Who I Know?

• UPC
• Price
• Tax Category

• Sale line item

• register

Attributes

• number

Services

• How much over interval
• How many over interval

Who I Know?

• Store
• Session

• Cash drawer (part of register)

• cash drawer

Attributes

• balance
• position (open, close)
• Operational state

Services

• open

Who I Know?

• register

• Tax Category

Attributes

• category
• rate
• effective date

Services

• get
• add
• set

Who I Know?

• items

Transactions

• sale

Attributes

• date and time

Services

• calculate subtotal
• calculate total
• calculate discount
• calculate tax
• commit

Who I Know

• session
• payment

• SLIs

• sale line item

Attributes

• date and time?
• quantity
• tax status (regular, resale, tax-exempt)

Services

• calculate sub total

Who I Know

• item

• sale

• return

Attributes

• return price
• reason code
• sale date
• sale price

Services

Who I Know

• payment

Attributes

• payment
  • amount paid
  • cash tendered
• check object
  • bank
  • account number
  • amount tendered
  • authorization code
• credit object
  • card type
  • card number
  • expiration date
  • authorization code

Services

Who I Know

• sale

• session

Attributes

• start date
• end date
• start time
• end time

Services

• how much money collected over interval
• how many sales

Who I Know

• register
• cashier
• store
• sales