Basic considerations for a textbook:
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-  Level of class  (developmental, on-level, honors)
- Â Price (and this should not be too high, regardless of your neighborhood)
- Reading level (It can exceed their grasp, but it shouldn’t do that by much.)
- Complexity (Is it really going to be usable?)
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Other considerations:
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- Visual (pretty colors, pretty pictures)
- Graphical (pretty diagrams, graphs, tables)
- Age (modern)
- Holes in your enthusiasm (It should fill those.)
- Additions not readily available on the internet  (It should give the students something they can’t get for free.)
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Things you do want:
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- Accuracy  (No major errors in fact or theory.)
- Relevance (Ought to work well for your class and not have to be worked around.)
- Readability (Has to be at a level the students can get.)
- Accessibility  (Information should be chunked, for easier understanding.)