A report is an objective message used to convey information between organizational areas or organizations to assist with decision making or problem solving. There are various types of reports, including formal or informal, informational or analytical, upward-directed or downward-directed, internal or external, and periodic or occasional. The formality of a report depends on factors such as whether it is for scientific research, a long or short proposal or letter, a periodic or non-routine memo. The typical sections of a report include the title page, letter of transmittal, table of contents, summary, introduction, body, conclusion, and appendix.