The Importance of User Tracking and the Challenges Faced by Amplitude


Hatched by Glasp

Aug 26, 2023

3 min read


The Importance of User Tracking and the Challenges Faced by Amplitude


In today's digital age, user tracking has become a crucial aspect of understanding user behavior and providing personalized experiences. Companies like Amplitude have developed intricate systems to track unique users, employing various identifiers such as device ID, user ID, and Amplitude ID. However, this process is not without its challenges, particularly when it comes to merging user data and ensuring accurate tracking. In this article, we will explore the significance of user tracking and delve into the complexities faced by Amplitude in addressing the merged user problem.

Understanding User Tracking:

User tracking allows companies to gather data on how users interact with their digital platforms. It enables them to analyze user behavior, measure engagement, and make data-driven decisions to enhance the user experience. Amplitude, a prominent analytics platform, employs a three-fold tracking system comprising device ID, user ID, and Amplitude ID. The device ID is randomly generated and persists unless browser cookies are cleared or the user is in private mode. The user ID, on the other hand, is a fixed identifier set by the user, representing an individual who remains consistent over time. Finally, the Amplitude ID is assigned by the platform to track recognized users.

The Merged User Problem:

One of the primary challenges faced by Amplitude is the merged user problem. This problem arises when an anonymous user with only a device ID is later identified as a recognized user with an Amplitude ID. To address this, Amplitude cross-references its list of Amplitude IDs with an internal mapping of merged IDs. However, user IDs cannot be merged. If a new user ID is created for an existing user, Amplitude will recognize them as separate unique users, leading to fragmented data and inaccurate insights. This highlights the importance of maintaining consistent user IDs.

Implications and Insights:

The merged user problem can have significant implications for businesses relying on accurate user tracking. Fragmented data can lead to incorrect analysis and misguided decision-making. To mitigate this issue, companies must prioritize the stability and consistency of user IDs. By encouraging users to maintain a single user ID and avoiding the creation of new IDs for existing users, businesses can ensure the integrity of their data and derive more meaningful insights.

Actionable Advice:

  • 1. Educate Users: Companies must educate their users about the importance of maintaining a consistent user ID. By explaining the benefits of accurate user tracking and emphasizing the need for a stable identifier, businesses can encourage users to avoid creating new IDs unnecessarily.
  • 2. Streamline User ID Creation: Implementing streamlined processes for user ID creation can help minimize the chances of users inadvertently creating new IDs. By providing clear instructions and user-friendly interfaces, businesses can reduce the likelihood of user errors and subsequent data fragmentation.
  • 3. Regular Data Audits: Conducting regular audits of user data can help identify and rectify instances of merged users. By cross-referencing and analyzing user IDs, businesses can ensure that merged users are correctly identified, avoiding data inaccuracies and improving the overall tracking process.


User tracking plays a vital role in understanding user behavior and driving business decisions. Amplitude's tracking system, incorporating device ID, user ID, and Amplitude ID, provides valuable insights. However, the merged user problem poses a challenge when it comes to accurate tracking. By educating users, streamlining user ID creation, and conducting regular data audits, businesses can overcome this challenge and leverage accurate user tracking to enhance their digital platforms. It is crucial for companies to continuously strive for rough consensus and running code, just as David Clark emphasized in 1992.

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