This article will help you:
- Understand the basics of users, events, and properties
- Learn techniques for planning your taxonomy
Using Amplitude effectively will first require you to identify the events and properties you want to track. Designing a solid, scalable taxonomy can help make your analyses easier, avoid data gaps, and prevent future data issues.
NOTE: To better reflect recent changes to Amplitude's product line, the previous Data Taxonomy Playbook series has been condensed into this article.
This playbook will review the strategy and considerations for creating your tracking plan.
Users, events, and properties: An introduction
Amplitude's analyses use a combination of events and properties associated with your users.
A user represents a unique individual taking an action or engaging in an activity related to your application. Amplitude uses multiple methods to identify and reconcile your users across various devices.
You can learn how Amplitude tracks unique users, including how to reconcile anonymous users before login.
An event is a distinct action or activity performed by a user within your product. Events can be active when a user has interacted with your app (for example, starting a game or adding to their cart) or they can be inactive (the user receives a push notification).
When naming events, we recommend establishing a consistent naming convention that uses:
Consistent capitalization: Amplitude will capture
song playedas two separate events, so this naming convention will help prevent messy data, especially when multiple teams are sending the same event.
A consistent syntax: Similarly,
Played Songwill also be considered separate events. For example, a standard of
[Past-Tense Verb]will make sure all your events are consistent.
A consistent actor: Does
Message Sentmean that the user sent a message or that we sent a message to the user? If all your events are always from the user's perspective, you'd know that this means the user sent a message.
Our default events are Title Cased from the user's perspective, with a
[Past Tense Verb]. You can follow establish your own convention if you wish, but the most important thing is that you remain consistent.
Properties are attributes that help define details around your events and users. At a high level:
Event properties are attributes that help describe details specific to the particular instance of an event. For example, if you had a
Purchase Completedevent, you could specify what the user purchased, the total value of the order, and the payment method used.
- User properties are traits describing the user and apply across all their future events until the properties are modified. Amplitude's SDK captures several user properties by default, and you can also set up your own properties to track.
You can learn more about the differences between how events and user properties behave in this article. Also, as with events, we recommend establishing a naming convention with a consistent casing.
Step 1: Define your business objectives
Starting with your goals and metrics helps to ensure you've prioritized the most important ones for your implementation. For example:
- What are you and your team working towards?
- What metric are you trying to optimize for?
- What questions are you looking to answer with data?
Some typical goals Amplitude customers pursue include:
- Improving acquisition ROI
- Finding the "aha" moment in the product
- Optimizing conversion
- Increasing user retention and LTV
Once you've identified your organization's overarching goals, it's easier to break them down into individual metrics and ensure your tracking plan measures your desired outcome.
Let's say, for example, you have an e-commerce app and are looking to increase purchases. You could do this by:
- Increasing the conversion rate of users through your purchase flow
- Increase the number of users who make multiple purchases
- Increasing the number of users coming to your app
Each of these could be your input metrics to achieve your goal. Prioritize these input metrics so you'll answer the most important question first. We recommend you adopt an iterative approach, in which you plan and instrument your most important metrics and iterate later to add more.
Step 2: Break down your key metrics
Now that you know your ultimate goal and have some hypotheses about how to accomplish that goal, you can break down those input metrics even further. What critical paths do your users take, and how do they involve each of those metrics? What actions are essential to each of those paths?
Let's say you're starting with increasing the conversion rate of users through your purchase flow. What are users' critical interactions with your application through the purchase flow? They could be:
- Search completed: The user has searched for an item to purchase
- Product details viewed: The user has viewed the details of an item
- Product added: The user has added an item to their order to purchase
- Order reviewed: The user has viewed the items in their order prior to purchase
- Order completed: The user has made a purchase and completed their order
For each of these, you can also think about the various factors involved in each step. For example:
- When using search, what term did the user search for?
- When they viewed an item, what was the
Product IDfor the item purchased?
One helpful technique is to think about the objects involved with each of these actions and make sure to have attributes of those actions in each event. For example, an item in your system likely has an ID, a category, and a price—all properties you can add to events related to your items.
Step 3: Optimize your events and properties
Lastly, you'll want to do some final optimizations on your plan. Ask yourself these questions:
Do you have multiple events for similar actions?
Suppose you have two user actions you could capture as two separate events, or as a single event with a property distinguishing the two distinct cases.
For example, perhaps you believe payment method is a critical factor, and you're wondering whether to instrument:
Order Completedas a single event with a
Payment Methodproperty that captures
Apple Pay, or
- Separate events for
Credit Card Order Completedand
Apple Pay Order Completed
There are a few things to consider:
- Start with your key metrics. In this case, while the purchase method is important, our key metric is our purchase flow conversion. A single
Order Completedevent would be easier to include in a funnel to see the overall purchase flow conversion.
- Is the event scalable? In this case, what happens when you introduce PayPal as a new payment method? Any chart measuring overall conversion would have to be updated. You'd also be using three events for an interaction where you could use one.
- Do you want to identify these separately in Journeys or User Look-Up? If so, a single
Order Completedevent is probably fine. However, if you took this to an extreme and made all your events
Page Clicked, you could see how having a series of generic
Page Clickedevents wouldn't be very helpful when looking at a user flow.
Are your property definitions consistent across your events?
Even though event properties are specific to each event, you should ensure they're defined consistently across your taxonomy. For example, instead of having a property called
Type that could represent a type of an item in one event and a type of payment in another, we recommend having separate properties:
Item Type and
Are your properties captured across all applicable events?
One typical use case for event properties is tracking values that must be held constant to count toward funnel conversion. For example, perhaps you want to know how often users add to cart after viewing details:
- Step 1:
Product Details Viewed
- Step 2:
Here, users should count as converted through the funnel only if they triggered the event on the same product. To ensure this, instrument the event property
Product ID and require the funnel to hold this value constant. Every event in the funnel must have that property for the holding constant feature to work.
- Step 1:
Product Details Viewed
- Step 2:
So, in this example, you can see how often a user adds to their cart after viewing an item. Without the
Product ID, you'd be analyzing how often a user adds any item to their cart after viewing any item.
You can refer to the steps in this playbook as you add new features or iterate on your product analytics. Amplitude Data provides ways to create and iterate on your plan directly in the product, or by importing a CSV file.
If you're interested in seeing more specific examples, check out our industry-specific best practices guides to see sample use cases and business questions, a recommended taxonomy, and a complementary dashboard that you can use for your implementation. We've tailored each to meet the specific needs of the following sectors:
If you are on a Growth or Enterprise plan, contact your Success Manager if you need help setting up your taxonomy. If you are not on a paid plan and would like to discuss event taxonomy, check out the Amplitude Community.