Final answer:
Exploratory testing is well-suited for incremental development without test charters, for testers with domain knowledge of similar systems, and when expert testers wish to determine the extent of further testing needed.
Step-by-step explanation:
Exploratory testing is suitable in several scenarios, but it's particularly effective when there is a lack of formal testing documentation and when testers have a strong understanding of the application and technology.
In the case of incremental development, where the system evolves over time and may not have detailed test plans, exploratory testing is ideal. Without a test charter, exploratory testing allows testers to probe the system, using their expertise and the knowledge they accumulate to guide their testing efforts thoroughly.
Testers with domain knowledge are also well-positioned to conduct exploratory testing because they can draw upon their experience with similar applications and technologies to uncover issues that might not be immediately apparent to those without such background.
Moreover, when an advanced knowledge of the system exists, exploratory testing can confirm the need for more intensive testing. Expert testers often have a sense of possible issues before they even begin formal testing, and exploratory testing can help identify any subtle mistakes or areas that may require a closer review, as part of a rigorous and ongoing evaluation process.