Operating Principles · PRINCIPLE_007
Choosing the Right Approach
On Waterfall, Agile, Fluid delivery, incident coordination, and scaling structure to fit the work.
Published: 2026-06-12
18 min read
The mistake is thinking there is one correct way to run every project. There is not. Some work needs a defined path, clear phases, formal signoff, and a disciplined handoff from one stage to the next. Some work needs exploration, iteration, prototypes, feedback loops, and the humility to admit that nobody knows the final shape yet. Some work, and this is where most real-world delivery lives, needs a structure strong enough to keep people aligned while still leaving room to adjust when the facts change, because the facts will change and pretending otherwise is how a clean plan becomes a very expensive work of fiction.
Choosing the right approach starts with telling the truth about the project. How much is known? How much is still being discovered? How fixed are the deadline, budget, scope, and approval path? How many stakeholders are involved? How much regulatory, legal, client, brand, technical, or operational risk exists? Does the team need speed, control, learning, predictability, or some difficult combination of all of them? The answer is rarely pure. The answer is usually some version of this: we know enough to start, not enough to finish blindly, and enough can go wrong that we need a method with eyes open.
This part is about choosing the approach on purpose instead of inheriting the loudest word in the room. Waterfall, Agile, Fluid, incident-style coordination, and small-project discipline all have a place, but none of them work when they are used as cover for unclear decisions, weak ownership, missing requirements, or a team that is being asked to move faster than the organization can think.
Waterfall, Agile, and Fluid Delivery
Waterfall and Agile get talked about like opposing teams, which makes for a lot of meetings where people argue about method while the actual project sits there waiting for someone to define the work. In practice, the question is less about which camp you belong to and more about what kind of uncertainty the project carries. If the goal is clear, the solution is clear, the approval path is clear, and the work needs to move through known phases, a more traditional approach may be exactly right. If the goal is clear but the solution has to be discovered through feedback, experimentation, or iterative development, then a more Agile approach may be the right fit. If the work has fixed business expectations but evolving details, then forcing it into either pure model may create more friction than value.
Waterfall works best when the project can tolerate planning before execution and when changes are expensive, risky, or need formal approval. It gives people a sequence. It gives stakeholders a sense of where they are in the work. It creates moments for requirements, design, build, review, approval, and closeout. There is nothing outdated about this when the project actually requires it. A building, a regulated launch, a fixed campaign package, a migration with defined dependencies, or a client deliverable with contractual milestones may need a traditional spine because the organization cannot simply discover the requirements as it goes and call that progress.
The problem with Waterfall is not Waterfall itself. The problem is pretending the requirements are stable when they are not, or treating the plan as sacred after the project has already proven that the plan was built on guesses. A traditional approach needs discipline, but it also needs a way to handle reality. If new information arrives, the project manager cannot just smile at the Gantt chart and hope reality apologizes. There has to be a change-control path, an impact assessment, a sponsor decision, and a willingness to revise the plan without pretending the revision is free.
Agile works best when the team is solving toward a goal and needs learning cycles to get there. The team may know what problem it is trying to solve but not know the best solution at the start, and in that case, iteration is not a lack of planning. It is the plan. The team works in smaller increments, gets feedback, adjusts, and keeps moving toward something usable. Done well, Agile creates visibility, learning, and ownership. Done badly, it becomes a series of meetings about flexibility where nobody wants to admit the scope is open-ended and the deadline is still somehow immovable.
The trap with Agile is using the word as permission to avoid decisions. Agile does not mean nobody has to define priorities. It does not mean the backlog is a junk drawer for every stakeholder thought. It does not mean the team can absorb constant change without cost. It does not mean documentation disappears. It means the project accepts uncertainty and creates a disciplined way to learn through it. Without discipline, Agile is just a softer word for churn.
Fluid delivery sits in the middle because a lot of working project managers live in the middle. The business may need dates, budgets, approvals, and executive reporting, but the team may still need to iterate through details, unknowns, dependencies, creative direction, stakeholder preferences, technical constraints, or changing market conditions. Fluid delivery says we will hold the frame and adapt the inside. We will define the objective, decision path, constraints, milestones, and governance, then allow the work inside that frame to evolve as the team learns more.
The method should answer the project, not decorate it
A method is useful only if it helps the team make decisions, manage work, and communicate reality. If it adds ceremony without clarity, it is overhead. If it creates reports nobody uses, it is theater. If it gives people new vocabulary but no better way to manage change, it is decoration. The project manager should be honest about that, even when the organization has a preferred label for how work is supposed to happen.
The right question is not, are we Agile or Waterfall? The right question is, what does this project need in order to move safely and intelligently from idea to outcome? Maybe it needs a charter, a requirements phase, and a formal approval gate. Maybe it needs a backlog, sprints, demos, and rapid feedback. Maybe it needs a timeline, a decision log, a tight change-control habit, and weekly priority resets because the work is moving through a client environment where the destination is known but the route keeps getting dug up.
Method selection is also a stakeholder-management decision. Some stakeholders need predictability more than speed. Some need working increments more than long planning cycles. Some need documentation because they will be accountable later. Some need visibility because they do not trust what they cannot see. Some say they want Agile, but what they really want is faster Waterfall with fewer consequences, and that has to be handled carefully because words like flexible can hide a lot of unpaid labor.
ApproachWorks best whenWatch forPM disciplineWaterfallThe work is known, the path is sequential, approvals matter, and changes need formal impact review.False certainty, late discovery, and treating the plan as more real than the project.Clear requirements, baselines, phase gates, change control, and stakeholder signoff.AgileThe goal is known, the solution needs discovery, and feedback can shape the work in useful increments.Endless churn, vague priorities, weak product ownership, or using flexibility to avoid decisions.Backlog discipline, sprint goals, demos, decision ownership, and visible tradeoffs.FluidThe business needs structure, but the work contains enough uncertainty that the team must adapt inside the frame.Unclear boundaries, hidden scope growth, or calling every change a normal adjustment.Defined guardrails, rolling planning, decision logs, change thresholds, and frequent recalibration.
How to choose the approach
Start with the amount of uncertainty. If the team can clearly define the deliverables, requirements, dependencies, review path, and success criteria, a more traditional plan may be appropriate. If the team can define the objective but not the solution, then the plan should include iteration. If the team can define some things clearly and has to discover others as it goes, then the method needs to support both commitment and adjustment.
Then look at the cost of change. Some projects can absorb change because the work is modular, the team can re-prioritize, and feedback creates better outcomes. Other projects cannot absorb change casually because one shift affects approvals, compliance, budget, downstream teams, production timelines, or a contract. A change that looks small to one stakeholder may be expensive in the actual delivery system, which is why method selection has to include the impact of change, not just the emotional appeal of flexibility.
Finally, look at the decision environment. A small team with direct access to a product owner can work differently than a cross-functional client project with legal, regulatory, brand, analytics, account, creative, development, and executive stakeholders all orbiting the work. The more complex the decision environment, the more intentional the governance needs to be, even if the work itself is iterative.
Selection questionIf the answer is yesWhat it suggestsAre the requirements stable and understood?The team can define the work before building most of it.Use a structured plan with clear milestones and change control.Is the solution still being discovered?The team needs learning cycles before the final answer becomes obvious.Use iterative delivery with disciplined feedback loops.Are approvals formal or high-risk?Change has external consequences beyond the delivery team.Add governance, signoff, and documented decision rights.Is the deadline fixed but scope flexible?The team may need to prioritize what fits inside the timebox.Use backlog discipline and explicit tradeoff decisions.Are stakeholders likely to keep adding detail?The project needs a way to absorb information without losing control.Use Fluid delivery with guardrails and change thresholds.
Incident-Management Principles for PMs
Some projects behave less like tidy planned work and more like an incident that has not admitted it is an incident yet. The signs are familiar: too many conversations, too many channels, unclear ownership, pressure rising faster than information, people asking for updates before anyone has had time to create facts, and a general sense that if someone does not establish order soon, the project is going to start managing the people instead of the other way around.
This is where incident-management principles can help, not because every project is an emergency and not because project managers should walk around pretending to run a command post, but because the discipline of incident coordination has useful habits for messy work. Establish who is coordinating. Create a single path for critical communication. Understand the current situation before issuing confident direction. Identify resources, constraints, priorities, risks, and next actions. Keep information moving. Reassess as conditions change. Close the loop when the incident, or the project phase pretending to be one, is stabilized.
The most useful idea is command clarity. Command clarity does not mean ego, volume, job title, or performative control. It means the team understands where information goes, who is coordinating the response, how decisions are made, what the current priority is, and where the next update will come from. Without that, people will create their own unofficial systems, and those systems may work locally while damaging the whole project.
A project manager stepping into a messy situation has to establish enough structure that people can stop thrashing. That may be as simple as creating a single tracker, naming the open decisions, confirming the immediate owners, setting a short update cadence, and telling the team what will be handled now versus later. The point is not to make the project feel militarized. The point is to give people a working frame when the room is overloaded.
Establish command, but do not confuse it with being the commander
There is a difference between establishing command and trying to be the commander. Establishing command means you make the operating system visible. You clarify who is coordinating, what information is known, what is unknown, what decisions are pending, who owns which action, and when the next update will happen. You are not trying to become the smartest person in the room. You are trying to keep the room from becoming a fog machine with calendar invites.
The project manager may not own every resource and may not have authority over every functional decision, but the project manager can still establish the coordination point. That coordination point matters. If every stakeholder goes directly to every team member and every team member answers in a different channel with a different version of the truth, the project becomes a rumor network with deliverables attached. The PM has to prevent that without becoming a bottleneck, which is not easy, but it is the job.
A clean communication path protects the work. It tells the team where to send updates, where decisions will be recorded, where blockers should be raised, and how urgent issues will be escalated. It also tells stakeholders what to expect, which matters because stakeholders who do not understand the communication structure will invent their own, usually at the worst possible time and with the highest possible confidence.
Incident principleProject translationPractical PM behaviorSituational awarenessUnderstand what is happening before reacting to the loudest signal.Build the current-state view: scope, dates, owners, risks, blockers, and decisions.Unity of communicationCritical information needs a reliable path.Create one source of truth and a known update cadence.Resource awarenessCapacity and capability determine what can actually happen.Confirm who is available, what they can do, and what competing work affects them.Priority controlNot everything can be first, especially under pressure.Name the immediate priority and what is deliberately not being handled yet.Action trackingIntent does not equal execution.Assign owners, due dates, dependencies, and follow-up points.After-action learningStabilization is not the end of the lesson.Run a short retrospective and capture what must change before the next cycle.
Do not import the wrong lessons
The incident-management lens is useful, but it has limits. Most projects are not life-safety events. Most client escalations are not disasters. Most late assets are not emergencies, even if the room is acting like they are. A project manager should borrow the discipline, not the drama. The goal is order, not adrenaline.
That distinction matters because some teams already live inside too much artificial urgency. If every delay becomes an emergency, then the team learns nothing except how to stay tense. If every stakeholder concern becomes a command activation, the project loses its ability to tell the difference between a true blocker and ordinary turbulence. Incident principles should help reduce panic, not professionalize it.
Used correctly, the approach gives the project manager a way to stabilize messy work without overcomplicating it. First, define the situation. Then define the immediate objective. Then define owners, communication, risks, decisions, and next actions. Then revisit the plan as new information arrives. That is not dramatic. That is just useful.
Managing Small Projects
Small projects are dangerous because everyone thinks they are small. That sounds ridiculous until you have watched a quick request become a half-built process, a tiny update become a stakeholder review chain, or a simple deliverable become a little ecosystem of assumptions that nobody documented because documenting it would have made the project feel bigger than anyone wanted to admit.
The size of a project does not remove the need for structure. It changes the amount of structure required. A small project does not need a fifty-page plan, a ceremony schedule, a weekly steering committee, and a dashboard that takes longer to update than the work takes to complete. But it still needs a goal, a scope boundary, an owner, a due date, a definition of done, and a way to know whether the thing being requested is still the thing being delivered.
Small projects fail quietly. They fail in side conversations, undocumented changes, friendly assumptions, missing approvals, unclear handoffs, and the dangerous phrase this should be easy. Easy work can still be misdirected. Easy work can still be late. Easy work can still be reworked five times because nobody clarified who had the final say. Easy work can still damage trust when it lands wrong.
The job is to scale the method down without removing the bones. Use a one-page brief instead of a full charter. Use a short tracker instead of a large schedule. Use a simple decision log instead of a governance deck. Use a lightweight risk note instead of a full risk register. But do not skip clarity just because the work looks small from far away.
The minimum structure for small work
A small project needs a few answers before anyone starts moving. What are we trying to accomplish? Who requested it? Who approves it? What is included? What is not included? When is it needed? What input do we need before work can begin? What does done mean? Where will decisions and changes be captured? These questions do not make the project heavy. They keep the project from becoming heavier later.
The smaller the project, the more tempting it is to keep everything in memory. That is usually fine until two people remember different versions of the same conversation. Then the project manager has to reconstruct reality from old emails, chat messages, meeting notes, and the confidence of people who are each certain they heard it correctly. A short written recap prevents that. It does not need to be beautiful. It just needs to exist.
Small projects also need closeout. This is the step that gets skipped most often because everyone is already moving to the next thing. But closeout does not have to be ceremonial. Confirm acceptance. Note what changed. Capture any follow-up. Archive the final files where someone can find them. If something went sideways, take five minutes to name why. A small project that teaches nothing becomes the same small problem again later with a different title.
Small-project controlMinimum versionWhy it mattersBriefOne page or one clear email covering goal, scope, owner, due date, and definition of done.Prevents the project from starting on vibes and partial memory.ScheduleA simple milestone list with dates and owners.Shows whether the work can actually fit inside the request.Decision logA short running list of decisions, owner, date, and rationale.Prevents settled items from coming back disguised as open questions.Change noteA quick impact statement when scope, timing, budget, or approval path changes.Makes small changes visible before they become large consequences.CloseoutAcceptance confirmation, final location, follow-up items, and one lesson learned.Turns completion into an actual handoff instead of a fadeout.
Scale the ceremony, not the accountability
The point of tailoring is not to avoid accountability. It is to apply the right amount of structure for the size and risk of the work. A small low-risk internal update may only need a brief, a due date, and a recap. A small regulated change may need formal approval because the risk is not small even if the effort is. A small executive-facing deliverable may need more review discipline because visibility changes the project profile. Size is only one factor.
This is where project managers need judgment. Too little process and the work gets sloppy. Too much process and the team spends more time feeding the machine than delivering the outcome. The right amount of process should feel like a handrail, not a cage. It should help people move, keep them from falling off the edge, and stay mostly invisible until someone needs it.
When the approach fits, the work feels less dramatic. That is one of the signs. People know where to look, what to do next, who owns the decision, how change will be handled, and what done means. The project may still be hard. It may still be messy. It may still have surprises. But the team is not also fighting the operating model, and that matters more than any methodology label on a slide.
Working Summary
Choosing the right approach is an act of honesty. It requires the project manager to look at the work as it actually is, not as the organization wishes it were, not as the sales conversation described it, not as the methodology deck suggests it should be, and not as the team might prefer it to be if there were more time, fewer stakeholders, cleaner inputs, and a little less gravity in the room.
Use Waterfall when the path is known and control matters. Use Agile when discovery is real and feedback can shape the outcome. Use Fluid when the project needs both structure and adaptation, which is often where practical delivery lives. Use incident-management principles when the work becomes overloaded and needs coordination before it can move. Use small-project discipline when the work looks simple enough to skip structure, because that is exactly when people start skipping the one piece of structure that would have saved them later.
The method is not the work. The method is how you help the work survive contact with reality. Choose it carefully, tailor it honestly, and change it when the project tells you the old container no longer fits.