In classic BattleTech gameplay, Record Sheets are a key component besides the game board, playing pieces, and dice. (Alpha Strike rules use a simplified data sheet, and the MechWarrior: Dark Age game uses the Clix system of dials in a given playing piece's base to depict its current status.)
Record Sheets are used by players to record the configuration and battlefield condition of an individual unit (playing piece), be it a BattleMech or another vehicle, infantry unit, or fixed gun emplacement. There are no record sheets for regular buildings, minefields, or other terrain features although depending on the scenario being played and the exact rules used, some sort of stats may have to be kept for these as well.
For standard gameplay, a unit's record sheet needs to include (at the bare minimum):
- some core game data about the unit, such as type, designation, mass, movement points, etc.;
- the individual sections/hit locations with their armor and internal structure values (where applicable); these usually take the form of boxes that are ticked off as damage is incurred; and
- the critical slots representing individual subsystems, to determine the exact configuration of the unit as well as to track damage to internal components (if applicable).
FASA and later FanPro and Catalyst Game Labs have produced and sold official record sheets, a product line going hand-in-hand with the popular Technical Readouts product line. "Official" blank record sheets for all unit types are also provided, and have been an important factor in the popular construction rules aspect of the game. Several software projects including the official Heavy Metal Pro suite and various fan projects also cater to this, and can produce record sheets.
Note that it is not technically required to use "official" record sheets for playing, as long as the exact unit configuration and condition is properly recorded somehow.
Record Sheets as products
The initial BattleTech, 2nd Edition rulebook contained only blank record sheets that players had to fill out. Notably, game stats for BattleMechs as given in the rulebooks and Technical Readouts do not mention where extra heat sinks (those that are not integral to the engine) are mounted, nor is it always clear if lower arm and hand actuators are present on a given design.
The BattleTech, 3rd Edition boxed set contained a record sheets booklet with official record sheets for the 14 basic 'Mech designs. Record Sheets have since become a game supplement product line alongside boardgame rules and Technical Readouts.