Multiple Models with Multiple Perspectives in a Cross-Functional Team

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Questions at menti.com 8937 4165 Crafting Your Digital Confidence

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Multiple Models with Multiple Perspectives in a Cross-Functional Team Case Study From Healthcare KanDDDinsky 2023 Mufrid Krilic, Domain-Driven Design Coach, CoWork, Norway

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About myself…. • Developer, architect, agile and technical coach • Healthcare, Telecom, Insurance • “Domain-Driven Design enthusiast” • Feel free to reach out! • www.linkedin.com/in/mufrid/ • [email protected] Crafting Your Digital Confidence

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CoWork - something to inspire you • Trust-Based Leadership in Practice Tight-Loose-Tight - TLT Crafting Your Digital Confidence

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Some light reading

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Why this talk…. «At times, it is bewildering to read all of the material on #DomainDrivenDesign posted here. Close to zero talk about the actual models being fleshed out or related breakthroughs, which, let's face it, are at the heart of it.» - Yves Reynhout on LinkedIn

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The topics to be covered • Strategies to learn complex domains • Domain problem decomposition • Aligning different perspectives in a cross-functional team • Delivering value in legacy constrained environments • Modeling breakthrough

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Let’s start with the story….

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Questions at menti.com 8937 4165 ▪ For patients with identical diagnoses sometimes the treatment has the best effect when done in a group of patients ▪ Examples from different subdomains in healthcare: • Conversation therapy groups in psychiatry • Training sessions post-injury Domain: Healthcare - Group Treatment

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The Team ….and the constraints

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Questions at menti.com 8937 4165 The business goal constraint • “Replace the legacy system” • It must work “everywhere” and for “everyone” • Is this really a business goal? • However, reality in many organizations

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Questions at menti.com 8937 4165 Legacy system constraint • ….or the opportunity? • Works “everywhere” and for “everyone” • Why are we replacing it? • “Complex systems run as broken systems.” • Quote from “How Complex Systems Fail” by Richard I. Cook

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Questions at menti.com 8937 4165 The team and the knowledge constraint • No prior/limited knowledge of the domain • Developers • Tester • Product Owner • Very knowledgeable in the domain • Very good overview of customer’s organization and history • Apprehensive that the customers might be using the legacy system in “unpredictable” ways • 4 developers • 1 QA • 1 Product owner

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Strategies to Learn Complex Domains Tight-Loose-Tight

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We deal with complexity by incentivize learning!

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Questions at menti.com 8937 4165 Two Mindsets • What kind of problems are you working on? • Simple • Complicated • or Complex Problems

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Simple problems -> no need for TLT! Simple Problems Best Practice Rational Decision Making Standards 5. Our Mission 4. Our Users 3. Our Plans 2. My Role 1. My Expertise Automate! Outer Alignment Inner Alignment

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If you have previous experience, stick to the plan! Complicated Problems We have previous experience We can trust the plan We can trust our judgement to guide the decisions 5. Our Mission 4. Our Users 3. Our Plans 2. My Role 1. My Expertise Outer Alignment Inner Alignment

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Hypothesis-driven development for complex problems Complex Problems Never done before Learn from Failure Challenge your assumptions We lack experience 5. Our Mission 4. Our Users 3. Our Plans 2. My Role 1. My Expertise Outer Alignment Inner Alignment

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Questions at menti.com 8937 4165 Combining leadership approach with strategic design • Tight-Loose-Tight • Discover purpose and needs (T) • Evaluating multiple models (L) • Challenge your assumptions (T)

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Questions at menti.com 8937 4165 TLT argues for Collaborative Modeling • Collaborative Modeling workshops • Discovering purpose and needs • All the right people in the same room • Different perspectives! • End-users and stakeholders from different departments • To challenge our assumptions

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Learning New Domain Healthcare – Group Treatment

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How to learn a new domain? 1.Discover Use Cases 2.Drill into scenarios using collaborative modeling techniques • Ask a bunch of questions 3.Listen! 4.Repeat step 2 on different or same(!) scenarios • Ask (hopefully) the right questions ☺

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Questions at menti.com 8937 4165 Use-Case Approach • Pre-workshop conversations • Identify the most common use cases • or the ones with most “pain”

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Questions at menti.com 8937 4165 ▪ Setting up a group • Planning ▪ Conducting group appointments • Check-in process Group Treatment Use Cases

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Collaborative Modeling in Practice

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Group Treatment Planning Somatic Department Rehabilitation after lifestyle affected diagnosis

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Group Treatment Check-In Somatic Department Rehabilitation after lifestyle affected diagnosis

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Group Treatment Planning Psychiatric Department Adult Psychiatry

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Group Treatment Check-In Psychiatric Department Adult Psychiatry

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Domain Problem Decomposition Validating different models using data ownership

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Questions at menti.com 8937 4165 Data Ownership • A business term is defined as a set of data properties

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Questions at menti.com 8937 4165 Functional Decomposition • Boundaries in the system follow the function that a user needs to do hers/his job • Classic approach • Subdomain = Function

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Group Treatment in Healthcare

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Domain Model

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Data Ownership in Domain Model – Functional Decomposition • One single “Group” for different functions • Physician and specialists • Patients • Appointments • Location/Venue • Patient attendance, including no-show • Patients exempted from payment • Invoice – preferred method • Diagnosis-based patient fee • Reference to § in law for compulsory interventions in psychiatry

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Questions at menti.com 8937 4165 Role-based decomposition • Boundaries in the system based on which roles perform different functions • Leads to more task-oriented model • Subdomain = Role based function

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Data Ownership in Domain Model – role-based decomposition “Group” planning context • Specialists • Patients • Appointments • Location • Reference to § in law for psychiatry “Group” check-in context • Patient attendance incl. no-show • Cancelled appointments • Patients exempted from payment • Invoice – preferred method • Diagnosis-based patient fee

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Questions at menti.com 8937 4165 Time- and role-based decomposition • Boundaries in the system based on which roles perform different function at different times • Supports context-oriented systems • Subdomain = Role-based function in a user context

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Data Ownership in Domain Model – time- and role-based decomposition “Group” planning context • Specialists • Patients • Appointments • Location • Reference to § in law for psychiatry “Group” check-in context • Patients exempted from payment • Invoice preferred method • Diagnosis-based patient fee “Group” billing context • Patient attendance, incl. no-show • Cancelled appointments

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Questions at menti.com 8937 4165 About Functional Decomposition • Customer/end-user needs are hidden behind functions! • No incentives to decompose • Pull towards canonical domain model

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Decision Time

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Questions at menti.com 8937 4165 End-users need flexibility • Somatic Rehabilitation • Different courses • Different diagnosis • Psychiatric Therapy • Adult groups • Pediatric groups • Different Locations

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Questions at menti.com 8937 4165 Flexibility and complexity • Allowing flexibility everywhere calls for highly customizable systems • Works for “everyone” and “everywhere” • High level of customization => high complexity • Configuration permutations

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Questions at menti.com 8937 4165 Flexibility within a Bounded Context • Different bounded contexts for different end-user needs • The degree of customization in a system is constrained to bounded contexts

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What did we do?

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Questions at menti.com 8937 4165 Why? • The time perspective separates the models • Group Checkin is about confirming what happened in an appointment • Group Planning is about how appointments are going to happen

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Decomposition approach with respect to the problem we are facing Complex Problems Never done before Learn from Failure Challenge your assumptions We lack experience 5. Our Mission 4. Our Users 3. Our Plans 2. My Role 1. My Expertise Outer Alignment Inner Alignment

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Team Maturity by Levels of Alignment Organization Steering Write unit tests Become better developer Deliver new feature Clinically effective group treatment for diverse patient needs Different user needs in group treatment in somatic and psychiatry Outer Alignment Inner Alignment 5. Mission 4. User 3. Project 2. Role and process 1. Expertise Developers, Product Owner, Tester Product Owner, Tester Using appropriate decomposition approach to reach higher Level of Alignment

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Multiple Models Reflected in Code Structure

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Questions at menti.com 8937 4165 Boundaries by Abstractions Use appropriate abstraction: • Repository • Namespaces • Whatever might be available in your programming environment

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Questions at menti.com 8937 4165 Bounded Models • Patient attendance incl. no-show • Cancelled appointments • Patients exempted from payment • Specialists • Patients • Appointments • Location • Reference to § in law for psychiatry

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Context Maps and discovering value chains Delivering value early

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Questions at menti.com 8937 4165 Context Mapping • Group Check-in has relation to three other contexts • Patient Visit • Patient Billing • Scheduling

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Questions at menti.com 8937 4165 Which relation describes our situation best? • “upstream-downstream relationship […]” • "the upstream team may succeed independently of the fate of the downstream team, [...] • Establish a clear customer/supplier relationship between the two teams • Negotiate and budget tasks for downstream requirements • (Source: DDD Reference by Eric Evans)

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Questions at menti.com 8937 4165 Using dependencies to our advantage • It turned out that dependencies were working in our favor • Other teams could help us achieve the goal with relatively little work on their side

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Questions at menti.com 8937 4165 Solved by navigating to other contexts using IDs patientID appointmentID UI Composition

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Questions at menti.com 8937 4165 UI Composition • Works well as context integration pattern in a multi-team distributed environment • Possible in most scenarios • Legacy systems “compliant”

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Questions at menti.com 8937 4165 Context Maps revealing possibility for early release • Achieving full autonomy could mean we need to do all the work ourselves • Group Planning • Negotiating deliveries with other teams to release early • Group Check-In

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Modeling Breakthrough Finally, Understanding the Business!

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Questions at menti.com 8937 4165 The Business and the Legacy System • The more complex the legacy system…. • ….and the longer the system is in production • ….the more likely that the domain language will be affected …. by the language of the legacy system!

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Questions at menti.com 8937 4165 Distilling the Domain with Pure Domain Stories • Capturing the very essence of the business processes Questions to ask: • How would you do your work without the software system? • What are you trying to achieve? • Why are you doing this?

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Group Planning Somatic Department

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Group Planning Psychiatric Department

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Departments •Accident and Emergency Department •Anaesthesia and Surgical Services •Cancer Treatment and Medical Physics •Children and Youth Clinic •Clinical Nutrition •Communication •Department of Occupational Therapy •Dermatology •Emergency Clinic •Emergency Department Short Stay Unit •Finance •Haukeland hotel •Heart Disease •Human Resources •Internal Medicine •International Collaboration •Laboratory Medicine and Pathology •Maternity Ward •Medical Biochemistry and Pharmacology MBF •Medical Genetics •Neurology •Neurosurgery •Occupational Medicine •Occupational Outpatient Clinic •Ophthalmology •Oral Surgery •Orthopedic Clinic •Physiotherapy •Psychiatry •Radiology department •Recruitment and Temporary Staffing Office •Regional Centre for Asthma, Allergy and Other Hypersensitivity illnesses in Western Norway •Research and Development •Rheumatology •Secretariat for hospital management •Surgical Clinic •The Cancer Center for Education and rehabilitation- CCER •The Norwegian Arthritis Registry - NorArthritis •The Norwegian Porphyria Centre NAPOS •Thoracic Medicine •Treatment abroad •Tuberculosis clinic •Women's Clinic

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Questions at menti.com 8937 4165 Decompositions by business capabilities • Boundaries in the system follow the capabilities that the business offers its’ customers • Subdomain = Business Capability • Subdomain ≠ Function • Foundation for the product architecture

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Data Ownership – Decomposition by Business Capabilities “Group” – psychiatry capability • Psychologist • Psychiatrist • Diagnosis • Reference to § in law • Patients • Appointments • Location for appointment outside hospital premises “Group” – medical clinical services • Physician • Diagnosis • Patients • Appointments

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Questions at menti.com 8937 4165 So…. Did we do anything about it? • Nothing ☺ • This insight came at slightly inconvenient time • How committed are you to the model you have chosen? • What is your TLT “mandate”?

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Questions at menti.com 8937 4165 Product architecture • There are some product related decisions to be made. • Which users are we tailoring our products for? • What is the cost of customizing the product for diverse user groups? • What is the cost of developing separate products for separate user groups?

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Wrapping up

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Questions at menti.com 8937 4165 So…. what have we learned? • Collaborative Learning by asking the right questions and listening • Legacy Systems constrains your thinking • Levels of Alignment helps you respect different perspectives • There is always another model • ….but modeling insights might come at most “inconvenient” times • Data Ownership as a tool to validate the model • Context Mapping as a tool to discover value chains

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Team Ultimum Follow us on GitHub!

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Questions at menti.com 8937 4165 Photos • https://unsplash.com/@ratushny • https://unsplash.com/@jeshoots • https://unsplash.com/@mango_quan • www.vecteezy.com