Textbook

Textbooks are items that provide recreation while increasing skills.

Acquisition

Textbooks, like all books, can be purchased from trade caravans, orbital traders and faction bases, or earned through quests.

When starting a new game, there is a chance for your starting colonists to carry books as possessions based on their traits or backstory.

Summary

Textbooks can be read by colonists as a recreation activity, with a recreation power of 1. All books will also train intellectual at a rate of 250 XP per in-game hour.

Each textbook has one or more associated skills. Colonists who read the book will gradually gain experience in those skills. The rate at which experience is gained and the maximum level to which the skill can be improved are both determined by the quality of the textbook.

Textbooks have a 25% chance of generating with two skills instead of one. Reading the book will train both skills at the same time, but the amount of XP provided for both skill will be divided by 1.6.

Colonists will try to avoid reading textbooks that they cannot learn anything from, unless no better book is available.

Effects of Quality on Reading
Quality	XP Rate		Max level
Quality	1 skill	2 skills	Max level
Awful	125 / Hour	78 / Hour	2
Poor	188 / Hour	117 / Hour	5
Normal	250 / Hour	156 / Hour	8
Good	312 / Hour	195 / Hour	10
Excellent	375 / Hour	234 / Hour	12
Masterwork	438 / Hour	273 / Hour	14
Legendary	500 / Hour	312 / Hour	16

Like any other book, textbooks will also train intellectual at a rate of 0.1 XP per 1 tick (0.02 secs), or 250 XP per in-game hour, in addition to the skills that the textbook generated with. This is calculated separately from the textbook's specific skills, and there is no soft limit to how high intellectual can be trained this way. However, this XP is gained at a fixed rate, and is not affected by the quality of the book or the reading bonus of the room.

All books can be efficiently stored in bookcases, allowing them to provide a bonus to any reading and research activities taking place within the same room. Each book stored in a nearby bookcase will increase the rate at which XP is gained from reading textbooks.

When reading for recreational purposes, colonists will choose which books to read at random. You can use the assign tab to specify which types of book a colonist is allowed to read, but you cannot assign a colonist to read any one specific book automatically.

You can manually force a colonist to read a specific book by selecting the colonist, right-clicking either the book itself or the bookcase containing it, then issuing the "read" command. The colonist will then read the target book for an hour before putting it away.

Analysis

Textbooks are generally an excellent way of raising the skills of your colonists, and they easily outclass other forms of recreation in this regard. For reference, a billiards table will provide 0.004 shooting XP per 1 tick (0.02 secs), for a learning rate of 10 XP per hour.

However, it should be noted that textbooks are the only recreation source with a maximum skill limit. An awful-quality textbook will train shooting faster than a billiards table only if the reader has a skill level below 2, and is utterly ineffective otherwise.

Textbooks that teach the shooting and melee skills are highly valuable, as colony defense remains an important concern for all colonists at all times. Medical is another high-priority skill, as hacing a large number of skilled doctors in your colony will increase the chances of recovering survivors from a hostile raid. Textbooks teaching other skills are also valuable for training up new recruits with low skills, or re-specializing colonists with nothing better to do.

More niche skills like artistic and intellectual are not as desirable for textbooks. These skills are usually only practiced by a few specialists within the colony, and can easily be trained while performing the relevant work.

Since colonists appear to select books at random when reading for joy, it may be useful to pick and choose which books you use to stock your library.

Textbooks with 2 skills provide a higher cumulative amount of XP, but less XP per skill. This generally makes dual-skill textbooks more valuable for raising skills overall, and single-skill textbooks more useful for raising a specific skill.