With SAP Web Application Server 6.20, the new extended Computer Aided Test Tool (eCATT) picks up where CATT leaves off. In addition to CATT's existing capabilities (the ability to record classic R/3 transactions, check and assign variables to fields, and create test cases), eCATT enables you to test controls-based and external transactions, use function modules with structured or tabular parameters in test scripts, write ABAP code directly in test scripts, and easily run an end-to-end test across your system landscape. This article introduces you to eCATT and details its most sought-after new function - the ability to test controls-based transactions.