Step 1: Define intra-firm vs inter-firm.
- Intra-firm analysis: Comparison within the same firm over time.
- Inter-firm analysis: Comparison between two or more firms in the same industry.
Step 2: Vertical analysis.
Vertical analysis refers to analysing financial statements by expressing each item as a percentage of a base figure (e.g., sales).
Step 3: Conclude.
Since the question specifies analysis of two or more organisations, the correct answer is Inter-firm analysis.
Final Answer:
\[
\boxed{\text{Inter-firm analysis}}
\]