Building and Testing a Trading System
Building the Trading Plan: Objective, Money Management, Routines
How a trading plan is actually assembled — the goal it serves, the rules that size your losses, and the schedule that keeps you honest.
You've spent this course learning to read a chart: trends, support and resistance, moving averages, entry and exit signals. Those are parts. This lesson is about the machine you build out of them.
A trading plan is your written rules for what you buy, when you exit, and how much you risk. Written is the load-bearing word. Rules you hold in your head aren't rules — they're intentions, and intentions get renegotiated at exactly the moment you need them not to be.
We're going to build the plan in the order it has to be built: objective, then what you're allowed to look at, then when you act, then how much you put at stake, then the schedule that keeps the whole thing running. The next lesson takes this template and fills it in end to end for one specific setup, so what you're reading here is the frame that lesson hangs on.
Start with the objective, or your rules are arbitrary
Video coming soon
This lesson explains the idea in full without it.
Every rule in a plan has to answer to something. Without a stated goal, "sell if it drops 5%" isn't right or wrong — it's just a number someone said. The objective is what makes a rule checkable.
So the plan opens with one sentence describing what this plan does. A good objective names four things:
- The style. Are you swing trading — trading the shorter swings inside a longer trend, holding days to weeks — or trend trading, holding for the length of the trend itself, typically weeks to months?
- The market conditions. Bullish, meaning you profit if price rises, or bearish, meaning you profit if it falls.
- The time frame. Short-term, intermediate-term, or long-term — and which trend sits inside which.
- The tools. Which technical elements generate your signals.
Put together, an objective reads something like: enter at support and exit at a target, to swing trade short-term bullish moves inside an intermediate-term uptrend. One sentence. It names the tools (support levels, targets), the style (swing trading), the conditions (bullish), and the time frame (short-term inside intermediate-term).
That sentence now does real work. Every rule that follows either serves it or doesn't belong. If your objective is short-term swings and you find yourself holding something for eight months because you like the company, the objective is what tells you that you've drifted into a different plan without deciding to.
Watch list criteria: deciding what you're allowed to consider
Once you know what the plan does, you can decide what it's allowed to touch. Your watch list is the set of securities your plan permits you to consider, and the watch list criteria are the written rules that decide what earns a spot.
This is a filter, not a shopping list. Being on the watch list doesn't mean buy — it means this one is eligible when a signal shows up.
The criteria should follow from the objective. If your plan swing trades bullish moves inside intermediate uptrends, then your criteria have to identify stocks that are actually in intermediate uptrends. A common way to write that: trade only stocks trading above an uptrending 50-day moving average. A moving average is the average price over a rolling window, used to smooth out noise, and a 50-day one tracks roughly the intermediate trend. If the stock is above it and the average itself is rising, the stock is in the kind of trend your plan is built to trade.
Figure
Other criteria are common and legitimate:
- Relative strength — how one investment performs compared to a benchmark. Some plans only consider stocks outperforming their sector or the broad market, on the reasoning that a strong trend is easier to trade than a weak one.
- Sector or industry filters — restricting the list to areas currently outperforming.
- Fundamentals layered on top — a plan can require growth or value characteristics from fundamental analysis (valuing a company by its business — earnings, assets, growth) before a stock is technically eligible at all. Combining the two is a normal approach, not a contradiction.
The criteria you choose are yours. What isn't optional is that they're written down and that they connect back to the objective.
Entries and exits inside the plan
You already know the mechanics — support bounces, resistance breaks, targets, stops. We covered those in depth earlier. What matters here is how they sit inside the document, because a signal is only useful when the plan says exactly when it counts.
Two considerations shape which tools you write into the plan.
Match the indicator to the trend you're trading. An indicator tuned to a different trend length will give you signals your plan can't use. Shorter windows react sooner and fire more often; longer windows react late and fire less. Neither is better — they answer different questions.
| Trend you're trading | Rough length | Commonly used moving average |
|---|---|---|
| Short-term | Under about three months | 10-day |
| Intermediate-term | About three to twelve months | 30-day to 50-day |
| Long-term | Longer than about a year | 200-day |
Inside a single band the tradeoff still applies. A 30-day average runs closer to price than a 50-day, so it hands you earlier entries and earlier exits — and more false ones. An exponential moving average (EMA), which weights recent days more heavily than older ones, reacts sooner than a simple moving average (SMA), which weights every day equally. Sooner is not the same as better. You're choosing between being early and being wrong less often, and you have to choose on purpose.
If you're considering an indicator you don't know, go read what the people who built it wrote about it — what it was designed to detect and what settings they found worked. Then read what other traders do with it, because plenty of them use it differently and find things the creator didn't. Both are worth your time. Neither is a rule you have to obey.
Consider the larger trend. The longer trend pushes on the shorter one. If you're swing trading the highs and lows inside an intermediate trend, and that intermediate trend is running with you, your entries have something behind them. If it's running against you, you're taking a position that needs the bigger tide to pause. This is exactly why the watch list criterion above — an uptrending 50-day average — exists in a bullish swing plan. The criterion and the entry rule are the same idea, applied at two different steps.
Money management: how you survive being wrong
This is the section beginners skim. It is the section that determines whether you're still here in two years.
Here's the thing nobody puts on the first page: you will be wrong. Not occasionally — routinely. Every system that has ever worked has been wrong a large fraction of the time. Being wrong isn't the failure case. Being wrong in a size you can't absorb is the failure case.
Money management is the part of the plan that controls how much a loss can hurt. It can stretch to cover asset allocation — how you split a portfolio across asset classes — and diversification — spreading money across many investments so no single one can sink you. But at its core it's one question: what does a bad trade cost me?
The answer starts with position sizing — deciding how much to put into a trade so that being wrong stays survivable. Two steps.
Step one: decide what a single trade may cost you
Portfolio risk is the amount of your whole account you're willing to lose on one trade if your stop triggers. Not the amount you invest — the amount you lose if it goes against you. Those are very different numbers, and confusing them is the most common sizing mistake there is.
You set it as a percentage of your total portfolio, then convert to dollars:
Portfolio risk in dollars = total portfolio value × percentage you'll risk per trade
What percentage? Here's where you have to be careful about what you're reading. The range you'll see quoted — somewhere between about half a percent and three percent per trade — is a range of choices other investors have made, not a measured fact about markets. Nobody discovered that 2% is correct. There is no experiment that returns that number.
The reasoning behind the range is worth having, though, because the reasoning is transferable even when the number isn't:
- Traders who place many trades tend toward the low end — around half a percent — partly to keep cash free for the next signal, and partly because many small losses at 3% each add up fast.
- Experienced traders who've watched themselves through a losing streak and know they don't flinch sometimes go to 2% or 3%.
- Most people land low. Not because the math demands it, but because losses are harder to sit through than anyone expects before they've had one. A small loss you can shrug off is a loss you won't abandon your plan over.
Pick your number by reasoning about your own situation — how often you'll trade, how many losses in a row you can take without changing your behavior, what the money is. Don't pick it because you read it somewhere, including here.
Step two: turn that into a number of shares
Now the arithmetic. Trade risk is what you lose per share if the stop triggers:
Trade risk = entry price − stop price
A stop-loss order is a standing order to sell if price falls to a set level, capping the loss. Your stop level came from your exit rules — from the chart, from where support sits — not from your wallet. That's important. You place the stop where the chart says your idea is wrong, then size the position around it. Sizing first and stopping wherever it happens to hurt less is backwards, and it's how people end up with stops sitting in the middle of ordinary noise.
Then:
Number of shares = portfolio risk ÷ trade risk
Let's run it at a size you might actually have.
Read that example again and notice what the percentage did. It's scale-free — it works identically at $4,000 and at $400,000, because it's a ratio. What changes with account size is the share count, not the logic. If you're starting small, the arithmetic still runs, and it hands you a smaller share count. Anyone who tells you position sizing is something to worry about later has it exactly backwards. The smaller your account, the less it can absorb, and the more the rule is doing for you.
The second rule: cap what any one position can be
There's a companion rule worth writing down: a limit on how much of the account any single position may occupy, regardless of what the risk math says. Something like never put more than 10% of the portfolio into one position. Again — that 10% is one investor's choice, not a law. Choose your own and know why.
It matters because it catches something the risk calculation misses. Watch:
In the example above, 26 shares of XYZ at $20.00 costs $520. That's 13% of a $4,000 account. The risk math was satisfied — you're only risking $40. But 13% of everything you have is now sitting in one fictional stock. A 10% cap says $400 maximum, which means 20 shares, not 26.
The two rules constrain different things. Portfolio risk limits what a normal loss costs — the stop works, you're out $40. The position cap limits what an abnormal loss costs — a gap down overnight straight through your stop, at which point the stop protects nothing and your exposure is the whole $520. Stops are orders, not force fields. Price can jump past them.
The cap does something quieter too: it keeps room in the account. If one position takes a third of your money, the next three signals your plan generates are signals you can't act on. The plan is still working. You just can't afford to listen to it.
Routines: the part that makes it a practice instead of a document
Video coming soon
This lesson explains the idea in full without it.
This section looks like the boring one. It's the enforcement mechanism.
Here's what actually happens to trading plans. Nobody wakes up and decides to abandon theirs. They drift. One position gets held a little past its exit because it feels like it's turning. One entry gets taken that didn't quite meet criteria, because it was close. Each one is small and defensible on its own. Six weeks later you're running a plan you never wrote and couldn't describe.
A routine is the scheduled set of management activities that catches that drift before it costs you. It's the difference between having a plan and running one. The routine is when you compare what you're actually doing against what you wrote down — and that comparison only helps if it happens on a schedule instead of when you feel like it. You will never feel like it on the day it matters most.
| Cadence | What you do | What it's actually protecting you from |
|---|---|---|
| Daily | Check open positions for exit signals first, then check the watch list for entry signals. Place orders or adjust stops per your rules. | Missing an exit because you were busy hunting for the next exciting entry. Existing positions come first for a reason — that's where your money already is. |
| Weekly | Update the watch list by running your criteria fresh. Re-read your market posture — your current call on the broad market's trend. | Trading a stale list, and trading against the tide without noticing the tide turned. |
| Monthly / quarterly | Review your results against your plan. Decide whether the system needs changing — or whether you need to start following it. | Repeating a mistake for a year because you never sat down and counted. |
A few things worth saying plainly about each.
Daily. The order is deliberate: existing trades first, watch list second. Exits are where your money is right now. Entries are where it might go. Under time pressure, people reliably do this backwards — the new idea is more interesting than the boring position that needs closing.
Weekly. Your watch list probably won't change much week to week, and that's fine. Stocks don't reinvent themselves in seven days. Run it anyway. The value isn't the churn — it's that you stay current on which names have momentum, so when a signal fires you already know the chart instead of meeting it for the first time with money on the line.
Market posture belongs here too. The broad market's long-term trend doesn't flip often or fast, so a weekly re-read is enough. But it does flip, and if you only update your read when you happen to notice something's wrong, you'll notice late. Trading a bullish plan into a market that turned over two months ago is fighting the current for no reason — you're spending real effort to end up behind where you started.
Monthly or quarterly. This is the honest accounting. Unless you're trading constantly, a month won't give you enough trades to conclude anything — a handful of results is noise, and reading meaning into noise is how people "optimize" a working system into a broken one. For most stock traders, quarterly is about right. Later in this course you'll learn how to evaluate a system properly: what counts as success, how to test rules against history, and which ratios tell you something real.
Figure
The journal is what makes the review possible
Threaded through all three cadences is the trading journal — a record of your trades and your reasoning, kept so you can learn from it. Log what you entered and exited, at what price, where your stop sat, what the trade made or lost, and which rule of your plan it came from.
The last one is the part people skip and the part that matters. A journal of prices tells you what happened. A journal that records which rule you were following tells you whether the rule works or whether you didn't follow it — and those two problems have opposite fixes. Change a rule that was actually fine and you've made your system worse while feeling like you did something.
Routines aren't complicated. They're a checklist and a calendar. What makes them hard is that they're boring on every single day except the ones where they save you, and you can't tell those days apart in advance. That's the whole argument for doing them on a schedule instead of on instinct.
Key takeaways
- The objective comes first because it's what makes every other rule checkable. One sentence naming your style, market conditions, time frame, and tools — then every rule below it either serves that sentence or doesn't belong.
- Watch list criteria decide what you're allowed to consider, not what to buy. They have to follow from the objective, and they have to be written down.
- Position sizing is how you survive being wrong, and you will be wrong routinely. Set what one trade may cost you as a percentage of the account, place the stop where the chart says you're wrong, and divide: portfolio risk ÷ trade risk = shares. Round down.
- The percentages you'll see quoted — half a percent to three percent per trade, ten percent max per position — are other investors' choices, not laws. Take the reasoning; choose your own numbers by thinking about your own situation.
- Routines are the enforcement mechanism, not paperwork. Daily for exits then entries, weekly for the watch list and market posture, quarterly for evaluating the plan itself. A plan you don't review on a schedule is a document, not a practice.
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