Difference Between Top-down and Bottom-up Approach

In this post, we will understand the difference between top-down approach and bottom-up approach.

Top-down Approach

  • In this approach, the problem is broken down into smaller parts.

  • It is generally used by structured programming languages such as C, COBOL, FORTRAN.

  • It may have redundancy since every part of the code is developed separately.

  • There is less interaction and communication between the modules.

  • Decomposition approach is used here.

  • It is generally difficult to identify.

  • The implementation depends on the programming language and platform.

  • It is generally used with documentation of module and debugging code.

Bottom-up Approach

  • In this approach, the smaller problems are solved.

  • These solved problems are integrated to find the solution to a bigger problem.

  • It is generally used with object oriented programming paradigm such as C++, Java, Python.

  • Data encapsulation and data hiding is implemented in this approach.

  • It is generally used in testing modules.

  • Composition approach is used here.